California's Renewable Energy Curtailment is a Growing Concern
California's renewable energy curtailment is a growing concern. In April alone, the California Independent System Operator (CAISO) had to curtail 919 GWh of solar and wind power. Data from the U.S. Energy Information Administration (EIA) indicates a 29% increase in curtailment from 2023 to 2024, overwhelmingly driven by excess solar generation. CAISO’s website clearly illustrates this issue, showing periods during the day when renewable energy output surpasses demand, even when factoring in battery storage needs. The trend of curtailed renewable energy isn't new; CAISO reports a consistent annual increase of over 10% for the past three years. Projections suggest this curtailment will likely surpass 1 terawatt-hour by 2026. The periods of highest curtailment typically occur in March.
