Bitcoin mines in the US have had a tremendous impact on power grids, a New York Times investigation reveals. The mines — which are giant data farms — use vastly more electricity than the communities surrounding them, driving up pollution from coal and gas power plants. The crypto mines also make electricity bills more expensive for their neighbors, even as the companies profit off incentives that grid operators offer to prevent blackouts during an energy crunch. This is the most comprehensive analysis yet of Bitcoin’s impact on the environment and energy system in the US. And it comes as Democratic…