Use Grid Forecast to plan energy use in Home on Mac (US only)
The electricity powering your home comes from different sources, which can include renewable energy, like solar and wind, or fossil fuels like coal and natural gas. The sources powering your home can change throughout the day. In the Home app on your Mac, you can see a forecast for your area that highlights times that can reduce carbon emissions to help you choose when to use electricity.
To view the Grid Forecast, you must be connected to the internet and Location Services must be turned on for the Home app.
Note: Grid Forecast is available only in the contiguous US, and not available in Alaska or Hawaii.
Show Grid Forecast
In the Home app
on your Mac, click Home in the sidebar.Click the Energy category to show the Grid Forecast.
Green bars indicate when cleaner energy is available in your area — from 10:00 am until 2:00 pm, for example. If there are no bars, cleaner energy isn’t in the forecast for the near future.
Note: If you haven’t added accessories to your home, the Grid Forecast appears when you open the Home app.
Receive Grid Forecast notifications
To receive notifications when the electricity powering your home is being generated by cleaner or more renewable sources of energy, do any of the following:
In the Home app
on your Mac, click the Notification button 
in the Grid Forecast.In the Home app
on your Mac, click the More button 
, choose Home Settings, click Energy, then turn on Show Grid Forecast.Control-click the Grid Forecast on the Home screen, then choose Notify Me About Next Cleaner Time.
Turn off Grid Forecast
In the Home app
on your Mac, click the More button , choose Home Settings, click Energy, then turn off Show Grid Forecast.