• That is also for NG plants is the bigger win TBH, coal is such a minor part of power generation in the US these days. Methane powered NG plants also have a worse heating effect as, although it produces less CO2 per BTU, it also has between 5-12% leak rate with in the supply chain, depending on who you ask, and that methane has about 40 times the GHG power as co2.