EnergyKit

Provide grid electricity forecasts to help users choose when to use electricity. EnergyKit identifies times when there is relatively cleaner or less expensive electricity on the grid, enabling apps to shift or reduce load accordingly. Targets Swift 6.3 / iOS 26+.

Beta-sensitive. EnergyKit is new in iOS 26 and may change before GM. Re-check current Apple documentation before relying on specific API details.

Contents

• Setup
• Core Concepts
• Querying Electricity Guidance
• Working with Guidance Values
• Energy Venues
• Submitting Load Events
• Electricity Insights
• Common Mistakes
• Review Checklist
• References

Setup

Entitlement

EnergyKit requires the com.apple.developer.energykit entitlement. Add it to your app's entitlements file.

Import

import EnergyKit

Platform availability: iOS 26+, iPadOS 26+.

Core Concepts

EnergyKit provides two main capabilities:

1. Electricity Guidance -- time-weighted forecasts telling apps when electricity is cleaner or cheaper, so devices can shift or reduce consumption
2. Load Events -- telemetry from devices (EV chargers, HVAC) submitted back to the system to track how well the app follows guidance

Key Types

Suggested Actions

Querying Electricity Guidance

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

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.

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

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 rating <= 0.3 { return .green }
        if rating <= 0.6 { return .yellow }
        return .red
    }

    var label: String {
        if rating <= 0.3 { return "Good" }
        if rating <= 0.6 { return "Fair" }
        return "Avoid"
    }

    var body: some View {
        Text(label)
            .padding(.horizontal, 8)
            .padding(.vertical, 4)
            .background(color.opacity(<