According to Nest's announcement, the feature will only be available to its energy partners' customers, since companies have to be willing to share TOU rates with the thermostat maker. At the moment, the only people who can access Time of Savings are SolarCity subscribers, but Nest says it's already in talks with other energy providers not just in the Golden State (including Southern California Edison), but across North America.

Ben Bixby, Nest's director of energy and enterprise business, said in a statement: