The share of electricity generated by each fuel source — coal, natural gas, nuclear, wind, solar, hydro, and others — by state at monthly resolution. Monthly data reveals seasonal patterns that annual averages obscure, such as solar's summer surge and hydro's spring peak.
Monthly generation data by fuel type and state are sourced from the EIA Form EIA-923 Electric Power Monthly. Only generation from the "Total Electric Power Industry" sector is included. Shares are computed by dividing each source's monthly generation (in GWh) by the total across all sources for that state and month.
EIA reports net generation, which can occasionally be slightly negative for a fuel — for example when a plant's own electricity use exceeds the small amount it generates in a month — producing a negative share. Because a negative share isn't meaningful here, any such values are shown as zero.
