Electricity generation from units that primarily consume coal in the U.S. Lower 48 states decreased for all hours of the day by about 23% between 2021 and 2023, according to our Form EIA-930, Hourly and Daily Balancing Authority Operations Report. Most of the decline occurred between 2022 and 2023, when coal-fired generation fell 19% and the average natural gas spot price at the Henry Hub decreased by more than 60%.