Nearly all industrial scale miners shut down their rigs in Texas while the state experienced a severe power crunch during the record heat wave in early July.

While the power crunch sent electricity prices soaring and made Bitcoin mining operations unprofitable, some large-scale miners such as Riot were able to sell electricity purchased earlier at a lower price back to the grid with a premium.

Riot is participating in the 4 Coincident Peak program from the state power operator known as the Electric Reliability Council of Texas. Riot’s 750-megawatt Whinstone Facility in Rockdale, Texas, is curtailing consumption when called during the four summer months of peak energy demand.