Electricity generation mix by fuel type for a US state (2-letter) or "US", from EIA — the most recent monthly net generation (thousand MWh) broken out by fuel (natural gas, coal, nuclear, solar, wind, hydro, etc.) with each fuel's percent share and the all-fuels total. Public-domain, live-wrap. Use for grid carbon-intensity, decarbonization, and energy-policy reasoning. (For benchmark energy prices use energy.prices; for retail electricity rates by state/sector use energy.electricity-rates.)