Figure

SCE default time-of-use rate versus the flat rate

On SCE's default TOU-D-4-9PM rate, the cheapest hours cost about 34 cents per kWh, matching the flat Schedule D rate, while the summer 4-to-9 PM peak costs about 58 cents (72% more). The design surcharges the summer evening rather than discounting midday.

Chart comparing SCE's default TOU-D-4-9PM rate with the flat Schedule D rate by period. Off-peak and midday match at about 34 cents per kWh; the summer 4-to-9 PM peak is about 58 cents, 72% higher.

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, "SCE default time-of-use rate versus the flat rate," Grid Flexibility, 2026. https://gridflexibility.fyi/case-studies/southern-california-edison/figures/tou-vs-flat

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Last updated: 2026-07-03.