We created an initiative that allowed Nest users to help out the grid and automatically save energy during the eclipse. It was a pretty simple premise that required little sacrifice – Nest thermostats automatically pre-cooled homes beforehand, so they could save energy during the eclipse. We also invited non-Nest users to participate manually via a full-page ad in the New York Times.

While the initiative was hyped in social, earned media and via blog post and email, Nest users were invited to participate directly from the screen of their thermostats. In the lead-up, hundreds of thousands opted in, posting photos & video of the simple iconic, graphic on social media.

As the eclipse traversed the United States, solar energy production dropped by thousands of megawatts. That’s when the initiative kicked in. Nest thermostats began syncing energy consumption with the eclipse’s path, using less energy when the grid needed it most.

As 8.21 approached, the idea of pre-cooling homes to hedge the effects of the eclipse was conceived. We were able to accomplish this because of Nest’s long-standing relationship with US energy suppliers. A Nest thermostat talks to the household’s energy provider to get real-time energy usage, and adjust accordingly. We used this technology as the basis of our execution. To do so, the mechanic relied on two variables: (1) data about energy consumption and resulting costs in your area; and (2) the path of the eclipse. The result of those two variables commanded each participating households’ Nest thermostat to seamlessly pre-cool homes before the grid was taxed and solar panels were thrown offline.

More than 750,000 Nest thermostats worked together to reduce energy demand by 700 MW during the eclipse, making up for over 5% of the lost solar capacity. Put another way, that’s around the same amount of power produced by seven gas-powered peaker plants. So together, it’s like we built a virtual power plant.