HB4734 Summary

• Extends deadlines for electric generating units (EGUs) and large greenhouse gas-emitting units to reduce CO2 and copollutant emissions by 10 years across multiple categories.

• Coal and oil-fired units not owned by public entities must reach zero emissions by January 1, 2040 (previously 2030).

• Coal-fired public units must reach zero emissions by December 31, 2055 (previously 2045) and achieve 45% emissions reductions by January 1, 2045 (previously 2035).

• Natural gas-fired units face phased deadlines: January 1, 2030 for high-emission units near environmental justice communities; January 1, 2040 for remaining high-emission units; January 1, 2045 for all others, with reductions achievable through retirement or 100% green hydrogen conversion.

• Requires annual emissions reporting beginning in 2025 and joint five-year progress reports starting in 2025 by the Environmental Protection Agency, Illinois Power Agency, and Illinois Commerce Commission, with provisions to delay deadlines only if resource adequacy or grid reliability issues are demonstrated.