A look at Block-funded Gridless, which operates bitcoin mines in Kenya, Malawi, and Zambia, powered through solar power and wasted energy from a geothermal site (MacKenzie Sigalos/CNBC)

MacKenzie Sigalos / CNBC:

A look at Block-funded Gridless, which operates bitcoin mines in Kenya, Malawi, and Zambia, powered through solar power and wasted energy from a geothermal site  —  WATCH NOW  —  Jack Dorsey backed start-up taps into geothermal, hydro and solar power to run bitcoin mines across Africa