Figure
The SP15 real-time evening premium (the 5-to-9 PM price minus the midday price) peaked near $62/MWh in 2022 during the SoCal gas crisis and sat near $30 in both 2019 and 2025, falling from 2024 to 2025 even as gas rose.
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, "SP15 real-time evening price premium, 2019-2025," Grid Flexibility, 2026. https://gridflexibility.fyi/case-studies/southern-california-edison/figures/evening-price-premium
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Last updated: 2026-07-03.
