A natural gas power plant can't always send excess energy into the grid, frequently leading to waste as the gas is flared or vented away. However, a plant in Dresden, New York thinks it has a solution: use that surplus to generate some digital cash. Greenidge Generation has revealed that it's using "behind-the-meter" energy at the facility to mine Bitcoin, with 7,000 mining systems producing up to 5.5BTC (about $45,000 as of this writing) per day.