diff --git a/example-action.sh b/example-action.sh
new file mode 100644
index 0000000..674dc80
--- /dev/null
+++ b/example-action.sh
@@ -0,0 +1,122 @@
+#!/bin/bash
+# NUPST Action Script Example
+# Copy this to /etc/nupst/ and customize for your needs
+#
+# This script is called by NUPST when power events or threshold violations occur.
+# It receives UPS state information via environment variables and command-line arguments.
+
+# ==============================================================================
+# ARGUMENTS (positional parameters)
+# ==============================================================================
+# $1 = Power Status (online|onBattery|unknown)
+# $2 = Battery Capacity (percentage, 0-100)
+# $3 = Battery Runtime (estimated minutes remaining)
+
+POWER_STATUS=$1
+BATTERY_CAPACITY=$2
+BATTERY_RUNTIME=$3
+
+# ==============================================================================
+# ENVIRONMENT VARIABLES
+# ==============================================================================
+# NUPST_UPS_ID               - Unique UPS identifier
+# NUPST_UPS_NAME             - Human-readable UPS name
+# NUPST_POWER_STATUS         - Current power status
+# NUPST_BATTERY_CAPACITY     - Battery percentage (0-100)
+# NUPST_BATTERY_RUNTIME      - Estimated runtime in minutes
+# NUPST_THRESHOLDS_EXCEEDED  - "true" if below configured thresholds
+# NUPST_TRIGGER_REASON       - "powerStatusChange" or "thresholdViolation"
+# NUPST_BATTERY_THRESHOLD    - Configured battery threshold percentage
+# NUPST_RUNTIME_THRESHOLD    - Configured runtime threshold in minutes
+# NUPST_TIMESTAMP            - Unix timestamp (milliseconds since epoch)
+
+# ==============================================================================
+# EXAMPLE: Log the event
+# ==============================================================================
+LOG_FILE="/var/log/nupst-actions.log"
+
+echo "========================================" >> "$LOG_FILE"
+echo "NUPST Action Triggered: $(date)" >> "$LOG_FILE"
+echo "----------------------------------------" >> "$LOG_FILE"
+echo "UPS: $NUPST_UPS_NAME ($NUPST_UPS_ID)" >> "$LOG_FILE"
+echo "Power Status: $POWER_STATUS" >> "$LOG_FILE"
+echo "Battery: $BATTERY_CAPACITY%" >> "$LOG_FILE"
+echo "Runtime: $BATTERY_RUNTIME minutes" >> "$LOG_FILE"
+echo "Trigger Reason: $NUPST_TRIGGER_REASON" >> "$LOG_FILE"
+echo "Thresholds Exceeded: $NUPST_THRESHOLDS_EXCEEDED" >> "$LOG_FILE"
+echo "========================================" >> "$LOG_FILE"
+
+# ==============================================================================
+# EXAMPLE: Send email notification
+# ==============================================================================
+# if [ "$NUPST_TRIGGER_REASON" = "thresholdViolation" ]; then
+#   echo "ALERT: UPS $NUPST_UPS_NAME battery critical!" | \
+#     mail -s "UPS Battery Critical" admin@example.com
+# fi
+
+# ==============================================================================
+# EXAMPLE: Gracefully shutdown virtual machines
+# ==============================================================================
+# if [ "$NUPST_POWER_STATUS" = "onBattery" ] && [ "$NUPST_THRESHOLDS_EXCEEDED" = "true" ]; then
+#   echo "Shutting down VMs..." >> "$LOG_FILE"
+#   # virsh shutdown vm1
+#   # virsh shutdown vm2
+#   # Wait for VMs to shutdown
+#   # sleep 120
+# fi
+
+# ==============================================================================
+# EXAMPLE: Call external API/service
+# ==============================================================================
+# curl -X POST https://monitoring.example.com/ups-alert \
+#   -H "Content-Type: application/json" \
+#   -d "{
+#     \"upsId\": \"$NUPST_UPS_ID\",
+#     \"upsName\": \"$NUPST_UPS_NAME\",
+#     \"powerStatus\": \"$POWER_STATUS\",
+#     \"batteryCapacity\": $BATTERY_CAPACITY,
+#     \"batteryRuntime\": $BATTERY_RUNTIME,
+#     \"triggerReason\": \"$NUPST_TRIGGER_REASON\"
+#   }"
+
+# ==============================================================================
+# EXAMPLE: Remote shutdown via SSH with password
+# ==============================================================================
+# You can implement custom shutdown logic for remote systems
+# that require password authentication or webhooks
+#
+# if [ "$NUPST_THRESHOLDS_EXCEEDED" = "true" ]; then
+#   # Call a webhook with a secret password/token
+#   curl -X POST "https://remote-server.local/shutdown?token=YOUR_SECRET_TOKEN"
+#
+#   # Or use SSH with password (requires sshpass)
+#   # sshpass -p 'your-password' ssh user@remote-server 'sudo shutdown -h +5'
+# fi
+
+# ==============================================================================
+# EXAMPLE: Conditional logic based on battery level
+# ==============================================================================
+# if [ "$BATTERY_CAPACITY" -lt 20 ]; then
+#   echo "Battery critically low! Immediate action needed." >> "$LOG_FILE"
+# elif [ "$BATTERY_CAPACITY" -lt 50 ]; then
+#   echo "Battery low. Preparing for shutdown." >> "$LOG_FILE"
+# else
+#   echo "Battery acceptable. Monitoring." >> "$LOG_FILE"
+# fi
+
+# ==============================================================================
+# EXAMPLE: Different actions for different trigger reasons
+# ==============================================================================
+# case "$NUPST_TRIGGER_REASON" in
+#   powerStatusChange)
+#     echo "Power status changed to: $POWER_STATUS" >> "$LOG_FILE"
+#     # Send notification but don't take drastic action yet
+#     ;;
+#   thresholdViolation)
+#     echo "Thresholds violated! Taking emergency action." >> "$LOG_FILE"
+#     # Initiate graceful shutdowns, save data, etc.
+#     ;;
+# esac
+
+# Exit with success
+exit 0
diff --git a/ts/actions/base-action.ts b/ts/actions/base-action.ts
new file mode 100644
index 0000000..6336cc3
--- /dev/null
+++ b/ts/actions/base-action.ts
@@ -0,0 +1,170 @@
+/**
+ * Base classes and interfaces for the NUPST action system
+ *
+ * Actions are triggered on:
+ * 1. Power status changes (online ↔ onBattery)
+ * 2. Threshold violations (battery/runtime cross below configured thresholds)
+ */
+
+export type TPowerStatus = 'online' | 'onBattery' | 'unknown';
+
+/**
+ * Context provided to actions when they execute
+ * Contains all relevant UPS state and trigger information
+ */
+export interface IActionContext {
+  // UPS identification
+  /** Unique ID of the UPS */
+  upsId: string;
+  /** Human-readable name of the UPS */
+  upsName: string;
+
+  // Current state
+  /** Current power status */
+  powerStatus: TPowerStatus;
+  /** Current battery capacity percentage (0-100) */
+  batteryCapacity: number;
+  /** Estimated battery runtime in minutes */
+  batteryRuntime: number;
+
+  // State tracking
+  /** Previous power status before this trigger */
+  previousPowerStatus: TPowerStatus;
+
+  // Metadata
+  /** Timestamp when this action was triggered (milliseconds since epoch) */
+  timestamp: number;
+  /** Reason this action was triggered */
+  triggerReason: 'powerStatusChange' | 'thresholdViolation';
+}
+
+/**
+ * Action trigger mode - determines when an action executes
+ */
+export type TActionTriggerMode =
+  | 'onlyPowerChanges' // Only on power status changes (online ↔ onBattery)
+  | 'onlyThresholds' // Only when action's thresholds are exceeded
+  | 'powerChangesAndThresholds' // On power changes OR threshold violations
+  | 'anyChange'; // On every UPS poll/check (every ~30s)
+
+/**
+ * Configuration for an action
+ */
+export interface IActionConfig {
+  /** Type of action to execute */
+  type: 'shutdown' | 'webhook' | 'script';
+
+  // Trigger configuration
+  /**
+   * When should this action be triggered?
+   * - onlyPowerChanges: Only on power status changes
+   * - onlyThresholds: Only when thresholds exceeded
+   * - powerChangesAndThresholds: On both (default)
+   * - anyChange: On every check
+   */
+  triggerMode?: TActionTriggerMode;
+
+  // Threshold configuration (applies to all action types)
+  /** Threshold settings for this action */
+  thresholds?: {
+    /** Battery percentage threshold (0-100) */
+    battery: number;
+    /** Runtime threshold in minutes */
+    runtime: number;
+  };
+
+  // Shutdown action configuration
+  /** Delay before shutdown in minutes (default: 5) */
+  shutdownDelay?: number;
+  /** Only execute shutdown on threshold violation, not power status changes */
+  onlyOnThresholdViolation?: boolean;
+
+  // Webhook action configuration
+  /** URL to call for webhook */
+  webhookUrl?: string;
+  /** HTTP method to use (default: POST) */
+  webhookMethod?: 'GET' | 'POST';
+  /** Timeout for webhook request in milliseconds (default: 10000) */
+  webhookTimeout?: number;
+  /** Only execute webhook on threshold violation */
+  webhookOnlyOnThresholdViolation?: boolean;
+
+  // Script action configuration
+  /** Path to script relative to /etc/nupst (e.g., "myaction.sh") */
+  scriptPath?: string;
+  /** Timeout for script execution in milliseconds (default: 60000) */
+  scriptTimeout?: number;
+  /** Only execute script on threshold violation */
+  scriptOnlyOnThresholdViolation?: boolean;
+}
+
+/**
+ * Abstract base class for all actions
+ * Each action type must extend this class and implement execute()
+ */
+export abstract class Action {
+  /** Type identifier for this action */
+  abstract readonly type: string;
+
+  /**
+   * Create a new action with the given configuration
+   * @param config Action configuration
+   */
+  constructor(protected config: IActionConfig) {}
+
+  /**
+   * Execute this action with the given context
+   * @param context Current UPS state and trigger information
+   */
+  abstract execute(context: IActionContext): Promise<void>;
+
+  /**
+   * Helper to check if this action should execute based on trigger mode
+   * @param context Action context with current UPS state
+   * @returns True if action should execute
+   */
+  protected shouldExecute(context: IActionContext): boolean {
+    const mode = this.config.triggerMode || 'powerChangesAndThresholds'; // Default
+
+    switch (mode) {
+      case 'onlyPowerChanges':
+        // Only execute on power status changes
+        return context.triggerReason === 'powerStatusChange';
+
+      case 'onlyThresholds':
+        // Only execute when this action's thresholds are exceeded
+        if (!this.config.thresholds) return false; // No thresholds = never execute
+        return this.areThresholdsExceeded(context.batteryCapacity, context.batteryRuntime);
+
+      case 'powerChangesAndThresholds':
+        // Execute on power changes OR when thresholds exceeded
+        if (context.triggerReason === 'powerStatusChange') return true;
+        if (!this.config.thresholds) return false;
+        return this.areThresholdsExceeded(context.batteryCapacity, context.batteryRuntime);
+
+      case 'anyChange':
+        // Execute on every trigger (power change or threshold check)
+        return true;
+
+      default:
+        return true;
+    }
+  }
+
+  /**
+   * Check if current battery/runtime exceeds this action's thresholds
+   * @param batteryCapacity Current battery percentage
+   * @param batteryRuntime Current runtime in minutes
+   * @returns True if thresholds are exceeded
+   */
+  protected areThresholdsExceeded(batteryCapacity: number, batteryRuntime: number): boolean {
+    if (!this.config.thresholds) {
+      return false; // No thresholds configured
+    }
+
+    return (
+      batteryCapacity < this.config.thresholds.battery ||
+      batteryRuntime < this.config.thresholds.runtime
+    );
+  }
+}
diff --git a/ts/actions/index.ts b/ts/actions/index.ts
new file mode 100644
index 0000000..049a5f3
--- /dev/null
+++ b/ts/actions/index.ts
@@ -0,0 +1,91 @@
+/**
+ * Action system exports and ActionManager
+ *
+ * This module provides the central coordination for the action system.
+ * The ActionManager is responsible for creating and executing actions.
+ */
+
+import { logger } from '../logger.ts';
+import type { Action, IActionConfig, IActionContext } from './base-action.ts';
+import { ShutdownAction } from './shutdown-action.ts';
+import { WebhookAction } from './webhook-action.ts';
+import { ScriptAction } from './script-action.ts';
+
+// Re-export types for convenience
+export type { IActionConfig, IActionContext, TPowerStatus } from './base-action.ts';
+export { Action } from './base-action.ts';
+export { ShutdownAction } from './shutdown-action.ts';
+export { WebhookAction } from './webhook-action.ts';
+export { ScriptAction } from './script-action.ts';
+
+/**
+ * ActionManager - Coordinates action creation and execution
+ *
+ * Provides factory methods for creating actions from configuration
+ * and orchestrates action execution with error handling.
+ */
+export class ActionManager {
+  /**
+   * Create an action instance from configuration
+   * @param config Action configuration
+   * @returns Instantiated action
+   * @throws Error if action type is unknown
+   */
+  static createAction(config: IActionConfig): Action {
+    switch (config.type) {
+      case 'shutdown':
+        return new ShutdownAction(config);
+      case 'webhook':
+        return new WebhookAction(config);
+      case 'script':
+        return new ScriptAction(config);
+      default:
+        throw new Error(`Unknown action type: ${(config as IActionConfig).type}`);
+    }
+  }
+
+  /**
+   * Execute a sequence of actions with the given context
+   * Each action runs sequentially, and failures are logged but don't stop the chain
+   * @param actions Array of action configurations to execute
+   * @param context Action context with UPS state
+   */
+  static async executeActions(
+    actions: IActionConfig[],
+    context: IActionContext,
+  ): Promise<void> {
+    if (!actions || actions.length === 0) {
+      return;
+    }
+
+    logger.log('');
+    logger.logBoxTitle(`Executing ${actions.length} Action(s)`, 60, 'info');
+    logger.logBoxLine(`Trigger: ${context.triggerReason}`);
+    logger.logBoxLine(`UPS: ${context.upsName} (${context.upsId})`);
+    logger.logBoxLine(`Power: ${context.powerStatus}`);
+    logger.logBoxLine(`Battery: ${context.batteryCapacity}% / ${context.batteryRuntime} min`);
+    logger.logBoxEnd();
+    logger.log('');
+
+    for (let i = 0; i < actions.length; i++) {
+      const actionConfig = actions[i];
+      try {
+        logger.info(`[${i + 1}/${actions.length}] ${actionConfig.type} action...`);
+
+        const action = this.createAction(actionConfig);
+        await action.execute(context);
+      } catch (error) {
+        logger.error(
+          `Action ${actionConfig.type} failed: ${
+            error instanceof Error ? error.message : String(error)
+          }`,
+        );
+        // Continue with next action despite failure
+      }
+    }
+
+    logger.log('');
+    logger.success('Action execution completed');
+    logger.log('');
+  }
+}
diff --git a/ts/actions/script-action.ts b/ts/actions/script-action.ts
new file mode 100644
index 0000000..f57e17d
--- /dev/null
+++ b/ts/actions/script-action.ts
@@ -0,0 +1,166 @@
+import * as path from 'node:path';
+import * as fs from 'node:fs';
+import { exec } from 'node:child_process';
+import { promisify } from 'node:util';
+import { Action, type IActionConfig, type IActionContext } from './base-action.ts';
+import { logger } from '../logger.ts';
+
+const execAsync = promisify(exec);
+
+/**
+ * ScriptAction - Executes a custom shell script from /etc/nupst/
+ *
+ * Runs user-provided scripts with UPS state passed as environment variables and arguments.
+ * Scripts must be .sh files located in /etc/nupst/ for security.
+ */
+export class ScriptAction extends Action {
+  readonly type = 'script';
+
+  private static readonly SCRIPT_DIR = '/etc/nupst';
+
+  /**
+   * Execute the script action
+   * @param context Action context with UPS state
+   */
+  async execute(context: IActionContext): Promise<void> {
+    // Check if we should execute based on trigger mode
+    if (!this.shouldExecute(context)) {
+      logger.info(`Script action skipped (trigger mode: ${this.config.triggerMode || 'powerChangesAndThresholds'})`);
+      return;
+    }
+
+    if (!this.config.scriptPath) {
+      logger.error('Script path not configured');
+      return;
+    }
+
+    // Validate and build script path
+    const scriptPath = this.validateAndBuildScriptPath(this.config.scriptPath);
+    if (!scriptPath) {
+      logger.error(`Invalid script path: ${this.config.scriptPath}`);
+      return;
+    }
+
+    // Check if script exists and is executable
+    if (!fs.existsSync(scriptPath)) {
+      logger.error(`Script not found: ${scriptPath}`);
+      return;
+    }
+
+    const timeout = this.config.scriptTimeout || 60000; // Default 60 seconds
+
+    logger.info(`Executing script: ${scriptPath}`);
+
+    try {
+      await this.executeScript(scriptPath, context, timeout);
+      logger.success('Script executed successfully');
+    } catch (error) {
+      logger.error(
+        `Script execution failed: ${error instanceof Error ? error.message : String(error)}`,
+      );
+      // Don't throw - script failures shouldn't stop other actions
+    }
+  }
+
+  /**
+   * Validate script path and build full path
+   * Ensures security by preventing path traversal and limiting to /etc/nupst
+   * @param scriptPath Relative script path from config
+   * @returns Full validated path or null if invalid
+   */
+  private validateAndBuildScriptPath(scriptPath: string): string | null {
+    // Remove any leading/trailing whitespace
+    scriptPath = scriptPath.trim();
+
+    // Reject paths with path traversal attempts
+    if (scriptPath.includes('..') || scriptPath.includes('/') || scriptPath.includes('\\')) {
+      logger.error('Script path must not contain directory separators or parent references');
+      return null;
+    }
+
+    // Require .sh extension
+    if (!scriptPath.endsWith('.sh')) {
+      logger.error('Script must have .sh extension');
+      return null;
+    }
+
+    // Build full path
+    return path.join(ScriptAction.SCRIPT_DIR, scriptPath);
+  }
+
+  /**
+   * Execute the script with UPS state as environment variables and arguments
+   * @param scriptPath Full path to the script
+   * @param context Action context
+   * @param timeout Execution timeout in milliseconds
+   */
+  private async executeScript(
+    scriptPath: string,
+    context: IActionContext,
+    timeout: number,
+  ): Promise<void> {
+    // Prepare environment variables
+    const env = {
+      ...process.env,
+      NUPST_UPS_ID: context.upsId,
+      NUPST_UPS_NAME: context.upsName,
+      NUPST_POWER_STATUS: context.powerStatus,
+      NUPST_BATTERY_CAPACITY: String(context.batteryCapacity),
+      NUPST_BATTERY_RUNTIME: String(context.batteryRuntime),
+      NUPST_TRIGGER_REASON: context.triggerReason,
+      NUPST_TIMESTAMP: String(context.timestamp),
+      // Include action's own thresholds if configured
+      NUPST_BATTERY_THRESHOLD: this.config.thresholds ? String(this.config.thresholds.battery) : '',
+      NUPST_RUNTIME_THRESHOLD: this.config.thresholds ? String(this.config.thresholds.runtime) : '',
+    };
+
+    // Build command with arguments
+    // Arguments: powerStatus batteryCapacity batteryRuntime
+    const args = [
+      context.powerStatus,
+      String(context.batteryCapacity),
+      String(context.batteryRuntime),
+    ].join(' ');
+
+    const command = `bash "${scriptPath}" ${args}`;
+
+    try {
+      const { stdout, stderr } = await execAsync(command, {
+        env,
+        cwd: ScriptAction.SCRIPT_DIR,
+        timeout,
+      });
+
+      // Log output
+      if (stdout) {
+        logger.log('Script stdout:');
+        logger.dim(stdout.trim());
+      }
+
+      if (stderr) {
+        logger.warn('Script stderr:');
+        logger.dim(stderr.trim());
+      }
+    } catch (error) {
+      // Check if it was a timeout
+      if (error instanceof Error && 'killed' in error && error.killed) {
+        throw new Error(`Script timed out after ${timeout}ms`);
+      }
+
+      // Include stdout/stderr in error if available
+      if (error && typeof error === 'object' && 'stdout' in error && 'stderr' in error) {
+        const execError = error as { stdout: string; stderr: string };
+        if (execError.stdout) {
+          logger.log('Script stdout:');
+          logger.dim(execError.stdout.trim());
+        }
+        if (execError.stderr) {
+          logger.warn('Script stderr:');
+          logger.dim(execError.stderr.trim());
+        }
+      }
+
+      throw error;
+    }
+  }
+}
diff --git a/ts/actions/shutdown-action.ts b/ts/actions/shutdown-action.ts
new file mode 100644
index 0000000..ae0d40c
--- /dev/null
+++ b/ts/actions/shutdown-action.ts
@@ -0,0 +1,142 @@
+import * as fs from 'node:fs';
+import { execFile } from 'node:child_process';
+import { promisify } from 'node:util';
+import { Action, type IActionConfig, type IActionContext } from './base-action.ts';
+import { logger } from '../logger.ts';
+
+const execFileAsync = promisify(execFile);
+
+/**
+ * ShutdownAction - Initiates system shutdown
+ *
+ * This action triggers a system shutdown using the standard shutdown command.
+ * It includes a configurable delay to allow VMs and services to gracefully terminate.
+ */
+export class ShutdownAction extends Action {
+  readonly type = 'shutdown';
+
+  /**
+   * Execute the shutdown action
+   * @param context Action context with UPS state
+   */
+  async execute(context: IActionContext): Promise<void> {
+    // Check if we should execute based on trigger mode and thresholds
+    if (!this.shouldExecute(context)) {
+      logger.info(`Shutdown action skipped (trigger mode: ${this.config.triggerMode || 'powerChangesAndThresholds'})`);
+      return;
+    }
+
+    const shutdownDelay = this.config.shutdownDelay || 5; // Default 5 minutes
+
+    logger.log('');
+    logger.logBoxTitle('Initiating System Shutdown', 60, 'error');
+    logger.logBoxLine(`UPS: ${context.upsName} (${context.upsId})`);
+    logger.logBoxLine(`Power Status: ${context.powerStatus}`);
+    logger.logBoxLine(`Battery: ${context.batteryCapacity}%`);
+    logger.logBoxLine(`Runtime: ${context.batteryRuntime} minutes`);
+    logger.logBoxLine(`Trigger: ${context.triggerReason}`);
+    logger.logBoxLine(`Shutdown delay: ${shutdownDelay} minutes`);
+    logger.logBoxEnd();
+    logger.log('');
+
+    try {
+      await this.executeShutdownCommand(shutdownDelay);
+    } catch (error) {
+      logger.error(
+        `Shutdown command failed: ${error instanceof Error ? error.message : String(error)}`,
+      );
+      // Try alternative methods
+      await this.tryAlternativeShutdownMethods();
+    }
+  }
+
+  /**
+   * Execute the primary shutdown command
+   * @param delayMinutes Minutes to delay before shutdown
+   */
+  private async executeShutdownCommand(delayMinutes: number): Promise<void> {
+    // Find shutdown command in common system paths
+    const shutdownPaths = [
+      '/sbin/shutdown',
+      '/usr/sbin/shutdown',
+      '/bin/shutdown',
+      '/usr/bin/shutdown',
+    ];
+
+    let shutdownCmd = '';
+    for (const path of shutdownPaths) {
+      try {
+        if (fs.existsSync(path)) {
+          shutdownCmd = path;
+          logger.log(`Found shutdown command at: ${shutdownCmd}`);
+          break;
+        }
+      } catch (_e) {
+        // Continue checking other paths
+      }
+    }
+
+    if (shutdownCmd) {
+      // Execute shutdown command with delay to allow for VM graceful shutdown
+      const message = `UPS battery critical, shutting down in ${delayMinutes} minutes`;
+      logger.log(`Executing: ${shutdownCmd} -h +${delayMinutes} "${message}"`);
+
+      const { stdout } = await execFileAsync(shutdownCmd, [
+        '-h',
+        `+${delayMinutes}`,
+        message,
+      ]);
+
+      logger.log(`Shutdown initiated: ${stdout}`);
+      logger.log(`Allowing ${delayMinutes} minutes for VMs to shut down safely`);
+    } else {
+      throw new Error('Shutdown command not found in common paths');
+    }
+  }
+
+  /**
+   * Try alternative shutdown methods if primary command fails
+   */
+  private async tryAlternativeShutdownMethods(): Promise<void> {
+    logger.error('Trying alternative shutdown methods...');
+
+    const alternatives = [
+      { cmd: 'poweroff', args: ['--force'] },
+      { cmd: 'halt', args: ['-p'] },
+      { cmd: 'systemctl', args: ['poweroff'] },
+      { cmd: 'reboot', args: ['-p'] }, // Some systems allow reboot -p for power off
+    ];
+
+    for (const alt of alternatives) {
+      try {
+        // First check if command exists in common system paths
+        const paths = [
+          `/sbin/${alt.cmd}`,
+          `/usr/sbin/${alt.cmd}`,
+          `/bin/${alt.cmd}`,
+          `/usr/bin/${alt.cmd}`,
+        ];
+
+        let cmdPath = '';
+        for (const path of paths) {
+          if (fs.existsSync(path)) {
+            cmdPath = path;
+            break;
+          }
+        }
+
+        if (cmdPath) {
+          logger.log(`Trying alternative shutdown method: ${cmdPath} ${alt.args.join(' ')}`);
+          await execFileAsync(cmdPath, alt.args);
+          logger.log(`Alternative method ${alt.cmd} succeeded`);
+          return; // Exit if successful
+        }
+      } catch (_altError) {
+        logger.error(`Alternative method ${alt.cmd} failed`);
+        // Continue to next method
+      }
+    }
+
+    logger.error('All shutdown methods failed');
+  }
+}
diff --git a/ts/actions/webhook-action.ts b/ts/actions/webhook-action.ts
new file mode 100644
index 0000000..dae9059
--- /dev/null
+++ b/ts/actions/webhook-action.ts
@@ -0,0 +1,141 @@
+import * as http from 'node:http';
+import * as https from 'node:https';
+import { URL } from 'node:url';
+import { Action, type IActionConfig, type IActionContext } from './base-action.ts';
+import { logger } from '../logger.ts';
+
+/**
+ * WebhookAction - Calls an HTTP webhook with UPS state information
+ *
+ * Sends UPS status to a configured webhook URL via GET or POST.
+ * This is useful for remote notifications and integrations with external systems.
+ */
+export class WebhookAction extends Action {
+  readonly type = 'webhook';
+
+  /**
+   * Execute the webhook action
+   * @param context Action context with UPS state
+   */
+  async execute(context: IActionContext): Promise<void> {
+    // Check if we should execute based on trigger mode
+    if (!this.shouldExecute(context)) {
+      logger.info(`Webhook action skipped (trigger mode: ${this.config.triggerMode || 'powerChangesAndThresholds'})`);
+      return;
+    }
+
+    if (!this.config.webhookUrl) {
+      logger.error('Webhook URL not configured');
+      return;
+    }
+
+    const method = this.config.webhookMethod || 'POST';
+    const timeout = this.config.webhookTimeout || 10000;
+
+    logger.info(`Calling webhook: ${method} ${this.config.webhookUrl}`);
+
+    try {
+      await this.callWebhook(context, method, timeout);
+      logger.success('Webhook call successful');
+    } catch (error) {
+      logger.error(
+        `Webhook call failed: ${error instanceof Error ? error.message : String(error)}`,
+      );
+      // Don't throw - webhook failures shouldn't stop other actions
+    }
+  }
+
+  /**
+   * Call the webhook with UPS state data
+   * @param context Action context
+   * @param method HTTP method (GET or POST)
+   * @param timeout Request timeout in milliseconds
+   */
+  private async callWebhook(
+    context: IActionContext,
+    method: 'GET' | 'POST',
+    timeout: number,
+  ): Promise<void> {
+    const payload: any = {
+      upsId: context.upsId,
+      upsName: context.upsName,
+      powerStatus: context.powerStatus,
+      batteryCapacity: context.batteryCapacity,
+      batteryRuntime: context.batteryRuntime,
+      triggerReason: context.triggerReason,
+      timestamp: context.timestamp,
+    };
+
+    // Include action's own thresholds if configured
+    if (this.config.thresholds) {
+      payload.thresholds = {
+        battery: this.config.thresholds.battery,
+        runtime: this.config.thresholds.runtime,
+      };
+    }
+
+    const url = new URL(this.config.webhookUrl!);
+
+    if (method === 'GET') {
+      // Append payload as query parameters for GET
+      url.searchParams.append('upsId', payload.upsId);
+      url.searchParams.append('upsName', payload.upsName);
+      url.searchParams.append('powerStatus', payload.powerStatus);
+      url.searchParams.append('batteryCapacity', String(payload.batteryCapacity));
+      url.searchParams.append('batteryRuntime', String(payload.batteryRuntime));
+      
+      url.searchParams.append('triggerReason', payload.triggerReason);
+      url.searchParams.append('timestamp', String(payload.timestamp));
+    }
+
+    return new Promise((resolve, reject) => {
+      const protocol = url.protocol === 'https:' ? https : http;
+
+      const options: http.RequestOptions = {
+        method,
+        headers: method === 'POST'
+          ? {
+            'Content-Type': 'application/json',
+            'User-Agent': 'nupst',
+          }
+          : {
+            'User-Agent': 'nupst',
+          },
+        timeout,
+      };
+
+      const req = protocol.request(url, options, (res) => {
+        let data = '';
+
+        res.on('data', (chunk) => {
+          data += chunk;
+        });
+
+        res.on('end', () => {
+          if (res.statusCode && res.statusCode >= 200 && res.statusCode < 300) {
+            logger.dim(`Webhook response (${res.statusCode}): ${data.substring(0, 100)}`);
+            resolve();
+          } else {
+            reject(new Error(`Webhook returned status ${res.statusCode}`));
+          }
+        });
+      });
+
+      req.on('error', (error) => {
+        reject(error);
+      });
+
+      req.on('timeout', () => {
+        req.destroy();
+        reject(new Error(`Webhook request timed out after ${timeout}ms`));
+      });
+
+      // Send POST data if applicable
+      if (method === 'POST') {
+        req.write(JSON.stringify(payload));
+      }
+
+      req.end();
+    });
+  }
+}
diff --git a/ts/cli/ups-handler.ts b/ts/cli/ups-handler.ts
index 602e7a0..7de1e47 100644
--- a/ts/cli/ups-handler.ts
+++ b/ts/cli/ups-handler.ts
@@ -77,10 +77,10 @@ export class UpsHandler {
           checkInterval: config.checkInterval,
           upsDevices: [{
             id: 'default',
-            name: 'Default UPS',
-            snmp: config.snmp,
-            thresholds: config.thresholds,
-            groups: [],
+        name: 'Default UPS',
+        snmp: config.snmp,
+        groups: [],
+        actions: [],
           }],
           groups: [],
         };
@@ -117,6 +117,7 @@ export class UpsHandler {
         runtime: 20,
       },
       groups: [],
+      actions: [],
     };
 
     // Gather SNMP settings
@@ -136,6 +137,9 @@ export class UpsHandler {
       await groupHandler.assignUpsToGroups(newUps, config.groups, prompt);
     }
 
+// Gather action settings
+    await this.gatherActionSettings(newUps.actions, prompt);
+
     // Add the new UPS to the config
     config.upsDevices.push(newUps);
 
@@ -221,16 +225,16 @@ export class UpsHandler {
     // Convert old format to new format if needed
     if (!config.upsDevices) {
       // Initialize with the current config as the first UPS
-      if (!config.snmp || !config.thresholds) {
-        logger.error('Legacy configuration is missing required SNMP or threshold settings');
+      if (!config.snmp) {
+        logger.error('Legacy configuration is missing required SNMP settings');
         return;
       }
       config.upsDevices = [{
         id: 'default',
         name: 'Default UPS',
         snmp: config.snmp,
-        thresholds: config.thresholds,
         groups: [],
+        actions: [],
       }];
       config.groups = [];
       logger.log('Converting existing configuration to multi-UPS format.');
@@ -265,9 +269,6 @@ export class UpsHandler {
     // Edit SNMP settings
     await this.gatherSnmpSettings(upsToEdit.snmp, prompt);
 
-    // Edit threshold settings
-    await this.gatherThresholdSettings(upsToEdit.thresholds, prompt);
-
     // Edit UPS model settings
     await this.gatherUpsModelSettings(upsToEdit.snmp, prompt);
 
@@ -279,6 +280,14 @@ export class UpsHandler {
       await groupHandler.assignUpsToGroups(upsToEdit, config.groups, prompt);
     }
 
+    // Initialize actions array if not exists
+    if (!upsToEdit.actions) {
+      upsToEdit.actions = [];
+    }
+
+    // Edit action settings
+    await this.gatherActionSettings(upsToEdit.actions, prompt);
+
     // Save the configuration
     await this.nupst.getDaemon().saveConfig(config);
 
@@ -396,13 +405,12 @@ export class UpsHandler {
         logger.logBox('UPS Devices', [
           'Legacy single-UPS configuration detected.',
           '',
-          ...((!config.snmp || !config.thresholds) 
-            ? ['Error: Configuration missing SNMP or threshold settings']
+          ...(!config.snmp 
+            ? ['Error: Configuration missing SNMP settings']
             : [
                 'Default UPS:',
                 `  Host: ${config.snmp.host}:${config.snmp.port}`,
                 `  Model: ${config.snmp.upsModel || 'cyberpower'}`,
-                `  Thresholds: ${config.thresholds.battery}% battery, ${config.thresholds.runtime} min runtime`,
                 '',
                 'Use "nupst ups add" to add more UPS devices and migrate',
                 'to the multi-UPS configuration format.',
@@ -506,9 +514,8 @@ export class UpsHandler {
    */
   private displayTestConfig(config: any): void {
     // Check if this is a UPS device or full configuration
-    const isUpsConfig = config.snmp && config.thresholds;
+    const isUpsConfig = config.snmp;
     const snmpConfig = isUpsConfig ? config.snmp : config.snmp || {};
-    const thresholds = isUpsConfig ? config.thresholds : config.thresholds || {};
     const checkInterval = config.checkInterval || 30000;
 
     // Get UPS name and ID if available
@@ -919,6 +926,151 @@ export class UpsHandler {
     }
   }
 
+  /**
+   * Gather action configuration settings
+   * @param actions Actions array to configure
+   * @param prompt Function to prompt for user input
+   */
+  private async gatherActionSettings(
+    actions: any[],
+    prompt: (question: string) => Promise<string>,
+  ): Promise<void> {
+    logger.log('');
+    logger.info('Action Configuration (Optional):');
+    logger.dim('Actions are triggered on power status changes and threshold violations.');
+    logger.dim('Leave empty to use default shutdown behavior on threshold violations.');
+
+    const configureActions = await prompt('Configure custom actions? (y/N): ');
+    if (configureActions.toLowerCase() !== 'y') {
+      return; // Keep existing actions or use default
+    }
+
+    // Clear existing actions
+    actions.length = 0;
+
+    let addMore = true;
+    while (addMore) {
+      logger.log('');
+      logger.info('Action Type:');
+      logger.dim('  1) Shutdown (system shutdown)');
+      logger.dim('  2) Webhook (HTTP notification)');
+      logger.dim('  3) Custom Script (run .sh file from /etc/nupst)');
+
+      const typeInput = await prompt('Select action type [1]: ');
+      const typeValue = parseInt(typeInput, 10) || 1;
+
+      const action: any = {};
+
+      if (typeValue === 1) {
+        // Shutdown action
+        action.type = 'shutdown';
+
+        const delayInput = await prompt('Shutdown delay in minutes [5]: ');
+        const delay = parseInt(delayInput, 10);
+        if (delayInput.trim() && !isNaN(delay)) {
+          action.shutdownDelay = delay;
+        }
+      } else if (typeValue === 2) {
+        // Webhook action
+        action.type = 'webhook';
+
+        const url = await prompt('Webhook URL: ');
+        if (!url.trim()) {
+          logger.warn('Webhook URL required, skipping action');
+          continue;
+        }
+        action.webhookUrl = url.trim();
+
+        logger.log('');
+        logger.info('HTTP Method:');
+        logger.dim('  1) POST (JSON body)');
+        logger.dim('  2) GET (query parameters)');
+        const methodInput = await prompt('Select method [1]: ');
+        action.webhookMethod = methodInput === '2' ? 'GET' : 'POST';
+
+        const timeoutInput = await prompt('Timeout in seconds [10]: ');
+        const timeout = parseInt(timeoutInput, 10);
+        if (timeoutInput.trim() && !isNaN(timeout)) {
+          action.webhookTimeout = timeout * 1000; // Convert to ms
+        }
+      } else if (typeValue === 3) {
+        // Script action
+        action.type = 'script';
+
+        const scriptPath = await prompt('Script filename (in /etc/nupst/, must end with .sh): ');
+        if (!scriptPath.trim() || !scriptPath.trim().endsWith('.sh')) {
+          logger.warn('Script path must end with .sh, skipping action');
+          continue;
+        }
+        action.scriptPath = scriptPath.trim();
+
+        const timeoutInput = await prompt('Script timeout in seconds [60]: ');
+        const timeout = parseInt(timeoutInput, 10);
+        if (timeoutInput.trim() && !isNaN(timeout)) {
+          action.scriptTimeout = timeout * 1000; // Convert to ms
+        }
+      } else {
+        logger.warn('Invalid action type, skipping');
+        continue;
+      }
+
+      // Configure trigger mode (applies to all action types)
+      logger.log('');
+      logger.info('Trigger Mode:');
+      logger.dim('  1) Power changes + thresholds (default)');
+      logger.dim('  2) Only power status changes');
+      logger.dim('  3) Only threshold violations');
+      logger.dim('  4) Any change (every ~30s check)');
+      const triggerInput = await prompt('Select trigger mode [1]: ');
+      const triggerValue = parseInt(triggerInput, 10) || 1;
+      
+      switch (triggerValue) {
+        case 2:
+          action.triggerMode = 'onlyPowerChanges';
+          break;
+        case 3:
+          action.triggerMode = 'onlyThresholds';
+          break;
+        case 4:
+          action.triggerMode = 'anyChange';
+          break;
+        default:
+          action.triggerMode = 'powerChangesAndThresholds';
+      }
+
+      // Configure thresholds if needed for onlyThresholds or powerChangesAndThresholds modes
+      if (action.triggerMode === 'onlyThresholds' || action.triggerMode === 'powerChangesAndThresholds') {
+        logger.log('');
+        logger.info('Action Thresholds:');
+        logger.dim('Action will trigger when battery or runtime falls below these values (while on battery)');
+        
+        const batteryInput = await prompt('Battery threshold percentage [60]: ');
+        const battery = parseInt(batteryInput, 10);
+        const batteryThreshold = (batteryInput.trim() && !isNaN(battery)) ? battery : 60;
+
+        const runtimeInput = await prompt('Runtime threshold in minutes [20]: ');
+        const runtime = parseInt(runtimeInput, 10);
+        const runtimeThreshold = (runtimeInput.trim() && !isNaN(runtime)) ? runtime : 20;
+
+        action.thresholds = {
+          battery: batteryThreshold,
+          runtime: runtimeThreshold,
+        };
+      }
+
+      actions.push(action);
+      logger.success(`${action.type.charAt(0).toUpperCase() + action.type.slice(1)} action added (mode: ${action.triggerMode || 'powerChangesAndThresholds'})`);
+
+      const more = await prompt('Add another action? (y/N): ');
+      addMore = more.toLowerCase() === 'y';
+    }
+
+    if (actions.length > 0) {
+      logger.log('');
+      logger.success(`${actions.length} action(s) configured`);
+    }
+  }
+
   /**
    * Display UPS configuration summary
    * @param ups UPS configuration
diff --git a/ts/daemon.ts b/ts/daemon.ts
index 95873e2..0e689ff 100644
--- a/ts/daemon.ts
+++ b/ts/daemon.ts
@@ -8,6 +8,8 @@ import type { ISnmpConfig } from './snmp/types.ts';
 import { logger, type ITableColumn } from './logger.ts';
 import { MigrationRunner } from './migrations/index.ts';
 import { theme, symbols, getBatteryColor, getRuntimeColor, formatPowerStatus } from './colors.ts';
+import type { IActionConfig } from './actions/base-action.ts';
+import { ActionManager, type IActionContext, type TPowerStatus } from './actions/index.ts';
 
 const execAsync = promisify(exec);
 const execFileAsync = promisify(execFile);
@@ -22,15 +24,10 @@ export interface IUpsConfig {
   name: string;
   /** SNMP configuration settings */
   snmp: ISnmpConfig;
-  /** Threshold settings for initiating shutdown */
-  thresholds: {
-    /** Shutdown when battery below this percentage */
-    battery: number;
-    /** Shutdown when runtime below this minutes */
-    runtime: number;
-  };
   /** Group IDs this UPS belongs to */
   groups: string[];
+  /** Actions to trigger on power status changes and threshold violations */
+  actions?: IActionConfig[];
 }
 
 /**
@@ -45,6 +42,8 @@ export interface IGroupConfig {
   mode: 'redundant' | 'nonRedundant';
   /** Optional description */
   description?: string;
+  /** Actions to trigger on power status changes and threshold violations */
+  actions?: IActionConfig[];
 }
 
 /**
@@ -97,7 +96,7 @@ export class NupstDaemon {
 
   /** Default configuration */
   private readonly DEFAULT_CONFIG: INupstConfig = {
-    version: '4.0',
+    version: '4.1',
     upsDevices: [
       {
         id: 'default',
@@ -118,16 +117,23 @@ export class NupstDaemon {
           // UPS model for OID selection
           upsModel: 'cyberpower',
         },
-        thresholds: {
-          battery: 60, // Shutdown when battery below 60%
-          runtime: 20, // Shutdown when runtime below 20 minutes
-        },
         groups: [],
+        actions: [
+          {
+            type: 'shutdown',
+            triggerMode: 'onlyThresholds',
+            thresholds: {
+              battery: 60, // Shutdown when battery below 60%
+              runtime: 20, // Shutdown when runtime below 20 minutes
+            },
+            shutdownDelay: 5,
+          },
+        ],
       },
     ],
     groups: [],
     checkInterval: 30000, // Check every 30 seconds
-  };
+  }
 
   private config: INupstConfig;
   private snmp: NupstSnmp;
@@ -199,7 +205,7 @@ export class NupstDaemon {
 
       // Ensure version is always set and remove legacy fields before saving
       const configToSave: INupstConfig = {
-        version: '4.0',
+        version: '4.1',
         upsDevices: config.upsDevices,
         groups: config.groups,
         checkInterval: config.checkInterval,
@@ -298,6 +304,8 @@ export class NupstDaemon {
           batteryRuntime: 999, // High value as default
           lastStatusChange: Date.now(),
           lastCheckTime: 0,
+          thresholdsExceeded: false,
+          lastThresholdCrossing: 0,
         });
       }
 
@@ -326,14 +334,14 @@ export class NupstDaemon {
         { header: 'Name', key: 'name', align: 'left', color: theme.highlight },
         { header: 'ID', key: 'id', align: 'left', color: theme.dim },
         { header: 'Host:Port', key: 'host', align: 'left', color: theme.info },
-        { header: 'Battery/Runtime', key: 'thresholds', align: 'left' },
+        { header: 'Actions', key: 'actions', align: 'left' },
       ];
 
       const upsRows: Array<Record<string, string>> = this.config.upsDevices.map((ups) => ({
         name: ups.name,
         id: ups.id,
         host: `${ups.snmp.host}:${ups.snmp.port}`,
-        thresholds: `${ups.thresholds.battery}% / ${ups.thresholds.runtime} min`,
+        actions: `${(ups.actions || []).length} configured`,
       }));
 
       logger.logTable(upsColumns, upsRows);
@@ -401,9 +409,6 @@ export class NupstDaemon {
           lastLogTime = currentTime;
         }
 
-        // Check if shutdown is required based on group configurations
-        await this.evaluateGroupShutdownConditions();
-
         // Wait before next check
         await this.sleep(this.config.checkInterval);
       } catch (error) {
@@ -466,6 +471,33 @@ export class NupstDaemon {
           logger.log('');
 
           updatedStatus.lastStatusChange = currentTime;
+
+          // Trigger actions for power status change
+          await this.triggerUpsActions(ups, updatedStatus, currentStatus, 'powerStatusChange');
+        }
+
+        // Check if any action's thresholds are exceeded (for threshold violation triggers)
+        // Only check when on battery power
+        if (status.powerStatus === 'onBattery' && ups.actions && ups.actions.length > 0) {
+          let anyThresholdExceeded = false;
+          
+          for (const actionConfig of ups.actions) {
+            if (actionConfig.thresholds) {
+              if (
+                status.batteryCapacity < actionConfig.thresholds.battery ||
+                status.batteryRuntime < actionConfig.thresholds.runtime
+              ) {
+                anyThresholdExceeded = true;
+                break;
+              }
+            }
+          }
+
+          // Trigger actions with threshold violation reason if any threshold is exceeded
+          // Actions will individually check their own thresholds in shouldExecute()
+          if (anyThresholdExceeded) {
+            await this.triggerUpsActions(ups, updatedStatus, currentStatus, 'thresholdViolation');
+          }
         }
 
         // Update the status in the map
@@ -519,137 +551,7 @@ export class NupstDaemon {
     logger.log('');
   }
 
-  /**
-   * Evaluate if shutdown is required based on group configurations
-   */
-  private async evaluateGroupShutdownConditions(): Promise<void> {
-    if (!this.config.groups || this.config.groups.length === 0) {
-      // No groups defined, check individual UPS conditions
-      for (const [id, status] of this.upsStatus.entries()) {
-        if (status.powerStatus === 'onBattery') {
-          // Find the UPS config
-          const ups = this.config.upsDevices.find((u) => u.id === id);
-          if (ups) {
-            await this.evaluateUpsShutdownCondition(ups, status);
-          }
-        }
-      }
-      return;
-    }
-
-    // Evaluate each group
-    for (const group of this.config.groups) {
-      // Find all UPS devices in this group
-      const upsDevicesInGroup = this.config.upsDevices.filter((ups) =>
-        ups.groups && ups.groups.includes(group.id)
-      );
-
-      if (upsDevicesInGroup.length === 0) {
-        // No UPS devices in this group
-        continue;
-      }
-
-      if (group.mode === 'redundant') {
-        // Redundant mode: only shutdown if ALL UPS devices in the group are in critical condition
-        await this.evaluateRedundantGroup(group, upsDevicesInGroup);
-      } else {
-        // Non-redundant mode: shutdown if ANY UPS device in the group is in critical condition
-        await this.evaluateNonRedundantGroup(group, upsDevicesInGroup);
-      }
-    }
-  }
-
-  /**
-   * Evaluate a redundant group for shutdown conditions
-   * In redundant mode, we only shut down if ALL UPS devices are in critical condition
-   */
-  private async evaluateRedundantGroup(
-    group: IGroupConfig,
-    upsDevices: IUpsConfig[],
-  ): Promise<void> {
-    // Count UPS devices on battery and in critical condition
-    let upsOnBattery = 0;
-    let upsInCriticalCondition = 0;
-
-    for (const ups of upsDevices) {
-      const status = this.upsStatus.get(ups.id);
-      if (!status) continue;
-
-      if (status.powerStatus === 'onBattery') {
-        upsOnBattery++;
-
-        // Check if this UPS is in critical condition
-        if (
-          status.batteryCapacity < ups.thresholds.battery ||
-          status.batteryRuntime < ups.thresholds.runtime
-        ) {
-          upsInCriticalCondition++;
-        }
-      }
-    }
-
-    // All UPS devices must be online for a redundant group to be considered healthy
-    const allUpsCount = upsDevices.length;
-
-    // If all UPS are on battery and in critical condition, shutdown
-    if (upsOnBattery === allUpsCount && upsInCriticalCondition === allUpsCount) {
-      logger.logBoxTitle(`Group Shutdown Required: ${group.name}`, 50);
-      logger.logBoxLine(`Mode: Redundant`);
-      logger.logBoxLine(`All ${allUpsCount} UPS devices in critical condition`);
-      logger.logBoxEnd();
-
-      await this.initiateShutdown(
-        `All UPS devices in redundant group "${group.name}" in critical condition`,
-      );
-    }
-  }
-
-  /**
-   * Evaluate a non-redundant group for shutdown conditions
-   * In non-redundant mode, we shut down if ANY UPS device is in critical condition
-   */
-  private async evaluateNonRedundantGroup(
-    group: IGroupConfig,
-    upsDevices: IUpsConfig[],
-  ): Promise<void> {
-    for (const ups of upsDevices) {
-      const status = this.upsStatus.get(ups.id);
-      if (!status) continue;
-
-      if (status.powerStatus === 'onBattery') {
-        // Check if this UPS is in critical condition
-        if (
-          status.batteryCapacity < ups.thresholds.battery ||
-          status.batteryRuntime < ups.thresholds.runtime
-        ) {
-          logger.logBoxTitle(`Group Shutdown Required: ${group.name}`, 50);
-          logger.logBoxLine(`Mode: Non-Redundant`);
-          logger.logBoxLine(`UPS ${ups.name} in critical condition`);
-          logger.logBoxLine(
-            `Battery: ${status.batteryCapacity}% (threshold: ${ups.thresholds.battery}%)`,
-          );
-          logger.logBoxLine(
-            `Runtime: ${status.batteryRuntime} min (threshold: ${ups.thresholds.runtime} min)`,
-          );
-          logger.logBoxEnd();
-
-          await this.initiateShutdown(
-            `UPS "${ups.name}" in non-redundant group "${group.name}" in critical condition`,
-          );
-          return; // Exit after initiating shutdown
-        }
-      }
-    }
-  }
-
-  /**
-   * Evaluate an individual UPS for shutdown conditions
-   */
-  private async evaluateUpsShutdownCondition(ups: IUpsConfig, status: IUpsStatus): Promise<void> {
-    // Only evaluate UPS devices not in any group
-    if (ups.groups && ups.groups.length > 0) {
-      return;
-    }
+  
 
     // Check threshold conditions
     if (
@@ -669,6 +571,64 @@ export class NupstDaemon {
     }
   }
 
+  /**
+   * Build action context from UPS state
+   * @param ups UPS configuration
+   * @param status Current UPS status
+   * @param triggerReason Why this action is being triggered
+   * @returns Action context
+   */
+  private buildActionContext(
+    ups: IUpsConfig,
+    status: IUpsStatus,
+    triggerReason: 'powerStatusChange' | 'thresholdViolation',
+  ): IActionContext {
+    return {
+      upsId: ups.id,
+      upsName: ups.name,
+      powerStatus: status.powerStatus as TPowerStatus,
+      batteryCapacity: status.batteryCapacity,
+      batteryRuntime: status.batteryRuntime,
+      previousPowerStatus: 'unknown' as TPowerStatus, // Will be set from map in calling code
+      timestamp: Date.now(),
+      triggerReason,
+    };
+  }
+
+  /**
+   * Trigger actions for a UPS device
+   * @param ups UPS configuration
+   * @param status Current UPS status
+   * @param previousStatus Previous UPS status (for determining previousPowerStatus)
+   * @param triggerReason Why actions are being triggered
+   */
+  private async triggerUpsActions(
+    ups: IUpsConfig,
+    status: IUpsStatus,
+    previousStatus: IUpsStatus | undefined,
+    triggerReason: 'powerStatusChange' | 'thresholdViolation',
+  ): Promise<void> {
+    const actions = ups.actions || [];
+
+    // Backward compatibility: if no actions configured, use default shutdown behavior
+    if (actions.length === 0 && triggerReason === 'thresholdViolation') {
+      // Fall back to old shutdown logic for backward compatibility
+      await this.initiateShutdown(`UPS "${ups.name}" battery or runtime below threshold`);
+      return;
+    }
+
+    if (actions.length === 0) {
+      return; // No actions to execute
+    }
+
+    // Build action context
+    const context = this.buildActionContext(ups, status, triggerReason);
+    context.previousPowerStatus = (previousStatus?.powerStatus || 'unknown') as TPowerStatus;
+
+    // Execute actions
+    await ActionManager.executeActions(actions, context);
+  }
+
   /**
    * Initiate system shutdown with UPS monitoring during shutdown
    * @param reason Reason for shutdown
diff --git a/ts/migrations/index.ts b/ts/migrations/index.ts
index 9bb2ccb..74e65fd 100644
--- a/ts/migrations/index.ts
+++ b/ts/migrations/index.ts
@@ -8,3 +8,4 @@ export { BaseMigration } from './base-migration.ts';
 export { MigrationRunner } from './migration-runner.ts';
 export { MigrationV1ToV2 } from './migration-v1-to-v2.ts';
 export { MigrationV3ToV4 } from './migration-v3-to-v4.ts';
+export { MigrationV4_0ToV4_1 } from './migration-v4.0-to-v4.1.ts';
diff --git a/ts/migrations/migration-runner.ts b/ts/migrations/migration-runner.ts
index 0578397..d01c703 100644
--- a/ts/migrations/migration-runner.ts
+++ b/ts/migrations/migration-runner.ts
@@ -1,6 +1,7 @@
 import { BaseMigration } from './base-migration.ts';
 import { MigrationV1ToV2 } from './migration-v1-to-v2.ts';
 import { MigrationV3ToV4 } from './migration-v3-to-v4.ts';
+import { MigrationV4_0ToV4_1 } from './migration-v4.0-to-v4.1.ts';
 import { logger } from '../logger.ts';
 
 /**
@@ -17,7 +18,8 @@ export class MigrationRunner {
     this.migrations = [
       new MigrationV1ToV2(),
       new MigrationV3ToV4(),
-      // Add future migrations here (v4→v5, v5→v6, etc.)
+      new MigrationV4_0ToV4_1(),
+      // Add future migrations here (v4.2, v4.3, etc.)
     ];
 
     // Sort by order to ensure they run in sequence
diff --git a/ts/migrations/migration-v4.0-to-v4.1.ts b/ts/migrations/migration-v4.0-to-v4.1.ts
new file mode 100644
index 0000000..5664e28
--- /dev/null
+++ b/ts/migrations/migration-v4.0-to-v4.1.ts
@@ -0,0 +1,125 @@
+import { BaseMigration } from './base-migration.ts';
+import { logger } from '../logger.ts';
+
+/**
+ * Migration from v4.0 to v4.1
+ *
+ * Major changes:
+ * 1. Moves thresholds from UPS level to action level
+ * 2. Creates default shutdown action for UPS devices that had thresholds
+ * 3. Adds empty actions array to UPS devices without actions
+ * 4. Adds empty actions array to groups
+ *
+ * Transforms v4.0 format:
+ * {
+ *   version: "4.0",
+ *   upsDevices: [
+ *     {
+ *       id: "ups-1",
+ *       name: "UPS 1",
+ *       snmp: {...},
+ *       thresholds: { battery: 60, runtime: 20 },  // UPS-level
+ *       groups: []
+ *     }
+ *   ]
+ * }
+ *
+ * To v4.1 format:
+ * {
+ *   version: "4.1",
+ *   upsDevices: [
+ *     {
+ *       id: "ups-1",
+ *       name: "UPS 1",
+ *       snmp: {...},
+ *       groups: [],
+ *       actions: [  // Thresholds moved here
+ *         {
+ *           type: "shutdown",
+ *           thresholds: { battery: 60, runtime: 20 },
+ *           onlyOnThresholdViolation: true,
+ *           shutdownDelay: 5
+ *         }
+ *       ]
+ *     }
+ *   ]
+ * }
+ */
+export class MigrationV4_0ToV4_1 extends BaseMigration {
+  readonly order = 5;
+  readonly fromVersion = '4.0';
+  readonly toVersion = '4.1';
+
+  async shouldRun(config: any): Promise<boolean> {
+    // Run if config is version 4.0 or missing version with v4 structure
+    if (config.version === '4.0') {
+      return true;
+    }
+
+    // Also run if config has upsDevices with thresholds at UPS level (v4.0 format)
+    if (config.upsDevices && config.upsDevices.length > 0) {
+      const firstDevice = config.upsDevices[0];
+      // v4.0 has thresholds at UPS level, v4.1 has them in actions
+      return firstDevice.thresholds !== undefined && firstDevice.actions === undefined;
+    }
+
+    return false;
+  }
+
+  async migrate(config: any): Promise<any> {
+    logger.info(`${this.getName()}: Migrating v4.0 config to v4.1 format...`);
+    logger.dim(`  - Moving thresholds from UPS level to action level`);
+    logger.dim(`  - Creating default shutdown actions from existing thresholds`);
+
+    // Migrate UPS devices
+    const migratedDevices = (config.upsDevices || []).map((device: any) => {
+      const migrated: any = {
+        id: device.id,
+        name: device.name,
+        snmp: device.snmp,
+        groups: device.groups || [],
+      };
+
+      // If device has thresholds at UPS level, convert to shutdown action
+      if (device.thresholds) {
+        migrated.actions = [
+          {
+            type: 'shutdown',
+            thresholds: {
+              battery: device.thresholds.battery,
+              runtime: device.thresholds.runtime,
+            },
+            triggerMode: 'onlyThresholds', // Preserve old behavior (only on threshold violation)
+            shutdownDelay: 5, // Default delay
+          },
+        ];
+        logger.dim(
+          `    → ${device.name}: Created shutdown action (battery: ${device.thresholds.battery}%, runtime: ${device.thresholds.runtime}min)`,
+        );
+      } else {
+        // No thresholds, just add empty actions array
+        migrated.actions = device.actions || [];
+      }
+
+      return migrated;
+    });
+
+    // Add actions to groups
+    const migratedGroups = (config.groups || []).map((group: any) => ({
+      ...group,
+      actions: group.actions || [],
+    }));
+
+    const result = {
+      version: this.toVersion,
+      upsDevices: migratedDevices,
+      groups: migratedGroups,
+      checkInterval: config.checkInterval || 30000,
+    };
+
+    logger.success(
+      `${this.getName()}: Migration complete (${migratedDevices.length} devices, ${migratedGroups.length} groups updated)`,
+    );
+    return result;
+  }
+}