Figure

Share of midday hours with negative real-time prices, 2019 to 2025

The share of midday hours with negative real-time prices rose from about 10% in 2019 to 37% in 2024, then eased to 30% in 2025 as more midday charging lifted prices off the floor.

Chart of the share of CAISO midday hours clearing negative real-time prices by year, rising from about 10% in 2019 to 37% in 2024 and easing to 30% in 2025.

This figure is from the Southern California Edison case study, a primary-source look at how California procured storage and what pointing the same playbook at demand would add.

Cite this figure

Corey Balgeman, "Share of midday hours with negative real-time prices, 2019-2025," Grid Flexibility, 2026. https://gridflexibility.fyi/case-studies/southern-california-edison/figures/negative-midday-surplus

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Last updated: 2026-07-03.