energykit

# EnergyKit

Use grid cleanliness and cost guidance to shift or reduce managed-device load.
For managed-device insights, submit the device's real load events promptly.

> **Beta-sensitive.** Core EnergyKit ships in iOS/iPadOS 26. The iOS/iPadOS 27
> `ElectricalLoadDevice` and Home-facing LoadEvents experience are beta; re-check
> current Apple documentation before relying on those APIs.

## Contents

- [Setup](#setup)
- [Core Concepts](#core-concepts)
- [Querying Electricity Guidance](#querying-electricity-guidance)
- [Working with Guidance Values](#working-with-guidance-values)
- [Energy Venues](#energy-venues)
- [Submitting Load Events](#submitting-load-events)
- [Electricity Insights](#electricity-insights)
- [Common Mistakes](#common-mistakes)
- [Review Checklist](#review-checklist)
- [References](#references)

## Setup

### Entitlements and Version Split

| Runtime | Load-event device API | Capabilities |
|---|---|---|
| iOS/iPadOS 26.x | `deviceID:` compatibility initializer | EnergyKit |
| iOS/iPadOS 27+ beta | `ElectricalLoadDevice` with the `device:` initializer | EnergyKit; add EnergyKit LoadEvents for Home app integration |

All EnergyKit use requires `com.apple.developer.energykit`; enable the EnergyKit
capability on the app target. On iOS/iPadOS 27+, add the EnergyKit LoadEvents
capability (`com.apple.developer.energykit.loadevents-experience`) only when the
app needs device names, energy context, activity logs, historical charts, or
trend notifications in the Home app. That Home experience requires both
capabilities. Missing permission can surface as `EnergyKitError.permissionDenied`.

### Import

```swift
import EnergyKit
```

**Platform availability:** Core EnergyKit APIs are iOS/iPadOS 26.0+. Some
insight breakdown APIs, including grid cleanliness categories, are 26.1+ and
need availability guards. Apple currently documents electricity guidance only
for the contiguous United States; handle `EnergyKitError.unsupportedRegion`.

## Core Concepts

EnergyKit provides two main capabilities:

1. **Electricity Guidance** -- time-weighted forecasts telling apps when
   electricity is cleaner and, when rate data is available, less expensive
2. **Load Events** -- telemetry from managed devices (EV chargers, HVAC)
   submitted by the same device/app that requested guidance so EnergyKit can
   generate insights

### Key Types

| Type | Role |
|---|---|
| `ElectricityGuidance` | Forecast data with weighted time intervals |
| `ElectricityGuidance.Service` | Interface for obtaining guidance data |
| `ElectricityGuidance.Query` | Query specifying shift or reduce action |
| `ElectricityGuidance.Value` | A time interval with a rating (0.0-1.0) |
| `EnergyVenue` | A physical location (home) registered for energy management |
| `ElectricVehicleLoadEvent` | Load event for EV charger telemetry |
| `ElectricHVACLoadEvent` | Load event for HVAC system telemetry |
| `ElectricalLoadDevice` | iOS/iPadOS 27+ beta device identity for load events |
| `ElectricityInsightService` | Service for querying energy/runtime insights |
| `ElectricityInsightRecord` | Historical energy or runtime data, optionally broken down by tariff or 26.1+ grid cleanliness |
| `ElectricityInsightQuery` | Query for historical insight data |

### Suggested Actions

| Action | Use Case |
|---|---|
| `.shift` | Devices that can move consumption to a different time (EV charging) |
| `.reduce` | Devices that can lower consumption without stopping (HVAC setback) |

## Querying Electricity Guidance

Use `ElectricityGuidance.Service` to get a forecast stream for a venue.

```swift
import EnergyKit

func observeGuidance(venueID: UUID) async throws {
    let query = ElectricityGuidance.Query(suggestedAction: .shift)
    let service = ElectricityGuidance.sharedService

    let guidanceStream = service.guidance(using: query, at: venueID)

    for try await guidance in guidanceStream {
        print("Guidance token: \(guidance.guidanceToken)")
        print("Interval: \(guidance.interval)")
        print("Venue: \(guidance.energyVenueID)")

        // Check if rate plan information is available
        if guidance.options.contains(.guidanceIncorporatesRatePlan) {
            print("Rate plan data incorporated")
        }
        if guidance.options.contains(.locationHasRatePlan) {
            print("Location has a rate plan")
        }

        processGuidanceValues(guidance.values)
    }
}
```

## Working with Guidance Values

Each `ElectricityGuidance.Value` contains a time interval and a rating
from 0.0 to 1.0. Lower ratings indicate better times to use electricity.

```swift
func processGuidanceValues(_ values: [ElectricityGuidance.Value]) {
    for value in values {
        let interval = value.interval
        let rating = value.rating  // 0.0 (best) to 1.0 (worst)

        print("From \(interval.start) to \(interval.end): rating \(rating)")
    }
}

// Find the best time to charge
func bestChargingWindow(
    in values: [ElectricityGuidance.Value]
) -> ElectricityGuidance.Value? {
    values.min(by: { $0.rating < $1.rating })
}

// Find all "good" windows below a threshold
func goodWindows(
    in values: [ElectricityGuidance.Value],
    threshold: Double = 0.3
) -> [ElectricityGuidance.Value] {
    values.filter { $0.rating <= threshold }
}
```

### Displaying Guidance in SwiftUI

```swift
import SwiftUI
import EnergyKit

struct GuidanceTimelineView: View {
    let values: [ElectricityGuidance.Value]

    var body: some View {
        List(values, id: \.interval.start) { value in
            HStack {
                VStack(alignment: .leading) {
                    Text(value.interval.start, style: .time)
                    Text(value.interval.end, style: .time)
                        .foregroundStyle(.secondary)
                }
                Spacer()
                RatingIndicator(rating: value.rating)
            }
        }
    }
}

struct RatingIndicator: View {
    let rating: Double

    var color: Color {
        if