Google is funding one of the nation's largest "virtual power plants," paying homes and businesses indirectly to reduce electricity consumption during periods of peak demand so more grid capacity can be available for data centers. Under its expanded deal with Voltus, the program could provide up to 1,070 megawatts in the Mid-Atlantic PJM grid -- roughly the output of a large nuclear reactor. The New York Times reports: That electricity won't come from new power plants. Instead, Voltus will sign up homes and businesses and give them financial incentives to curb their usage when local power demand is high or the grid is strained. Many of these reductions could occur automatically, such as through smart thermostats that dial back air-conditioning during peak summer hours or batteries that can provide temporary on-site power.

Each of these tweaks frees up only a small amount of power on its own.…