Helping Riverside County homeowners navigate SCE rates and solar options since 2020
If your SCE bill is predictable in winter but shocks you every June, the cause is almost always Time-of-Use pricing combined with summer AC load. Most SCE residential customers are on a TOU rate plan, which means the price of electricity is not flat. It changes by hour. The most expensive hours happen to be the exact hours most Temecula homes run their air conditioning hardest.
This article explains how TOU pricing works, what the peak rate costs you, shows a real bill example, and explains how solar with battery storage removes this problem entirely.
1. How SCE Time-of-Use Pricing Works
Time-of-Use (TOU) pricing means SCE charges different rates depending on when you use electricity, not just how much you use. The rate structure is designed to shift demand away from peak grid stress periods, which happen when everyone gets home from work and turns on AC, TVs, and appliances simultaneously.
SCE automatically places most new residential customers on the TOU-D rate plan. If you have not actively chosen a rate plan, you are likely on TOU-D already. The plan has two daily periods: peak (expensive) and off-peak (cheaper). There is also a mid-peak tier on some plans.
The 59 cent summer weekday on-peak rate is about 79% higher than the 33 cent off-peak rate (59 / 33 = 1.79). Every kWh you use between 4pm and 9pm costs nearly 1.8 times what it would cost at 10pm. During summer, that window is also when your AC is working hardest to cool down a house that has been heating up all day.
2. Peak vs Off-Peak Hours in 2026
The TOU-D-4-9PM peak window is 4pm to 9pm every day, including weekends. This did not change in 2026. Inside that window, the summer (June through September) weekday on-peak rate is 59 cents per kWh, and the summer weekend mid-peak rate is 44 cents (per SCE's rate page, checked October 7, 2026).
3. Why Summer Bills Spike So Much
Temecula and Murrieta average high temperatures above 95 degrees in July and August. Homes in these cities frequently run AC from mid-afternoon through late evening. That overlap with the 4-9pm peak window is the direct cause of summer bill spikes.
The problem compounds when homes exceed their baseline allocation. Most Inland Empire homes blow past the Tier 1 baseline during summer. Once you are in Tier 2 usage territory, you are paying 39 cents per kWh on the tiered plan, or on TOU-D-4-9PM 33 cents off-peak and 59 cents on-peak on summer weekdays (SCE's rate pages, checked October 7, 2026). The two surcharges stack. See the 8-year bill projection to see how those rates compound through 2034.
The Summer Bill Multiplier Effect
Result: a household that pays $150/month in January can easily pay $350-400/month in July under the same rate plan with no behavior changes.
4. Real Bill Example at $300/Month Average
Consider a Temecula household that averages $300 per month across the year. That average masks a wide seasonal range. In practice, TOU pricing combined with summer heat creates a pattern that looks something like this.
The same home, same rate plan, no behavior change. The August bill is nearly three times the January bill. That swing is structural, driven by how TOU pricing interacts with summer AC load in the Inland Empire climate.
5. How Solar and Battery Sidestep TOU Pricing
Solar panels generate the most electricity during midday hours (roughly 9am to 3pm). Under the TOU structure, this is the off-peak or super off-peak period when grid electricity is cheapest anyway. On their own, solar panels save money during low-cost hours.
The real TOU solution is solar combined with a battery. A properly sized battery stores excess midday solar production and discharges it during the 4-9pm peak window. Instead of drawing 59-cent grid electricity during the most expensive hours, the battery powers the home using energy collected at midday when the solar panels were running at full capacity.
Under NEM 3.0 (the current California solar export policy), battery storage is no longer optional for solar to make financial sense. The old model of sending excess daytime solar back to the grid at retail rates is gone. A battery keeps that energy and uses it against the most expensive grid hours instead. See what solar does to a $200+ bill with real SCE numbers.
See Your Savings Before Summer Rates Hit
Enter your current SCE bill and get a side-by-side comparison showing what a PPA would cost you vs what SCE will charge you this summer. No phone number required to see the numbers.
Calculate My Summer SavingsCalculate Your Savings By City
Summer savings vary by city. Pick yours for a location-specific estimate.
Frequently Asked Questions
SCE TOU-D peak hours are 4pm to 9pm every day, including weekends and holidays. On TOU-D-4-9PM, the summer (June through September) weekday on-peak rate in that window is 59 cents per kWh and the summer weekend mid-peak rate is 44 cents (per SCE's rate page, checked October 7, 2026). This window did not change in 2026.
Summer bill spikes result from three overlapping factors: higher total kWh usage from AC, Tier 2 pricing that kicks in once you exceed your baseline allocation, and the TOU peak rate applying during the exact hours when AC usage is highest (4-9pm). All three happen simultaneously in June through August.
Solar panels generate power during midday hours, which are off-peak under TOU pricing. To directly address the 4-9pm peak window, you need a battery. A solar-plus-battery system stores midday energy and discharges it during peak hours, reducing or eliminating the 59-cent summer weekday on-peak exposure.
A household averaging $300/month across the year typically pays $140-160 in January and $380-450 in peak summer months. The summer spike is driven by TOU peak pricing, Tier 2 usage rates, and higher AC consumption. The $300 average masks a significant seasonal swing.
TOU-D is SCE's standard residential Time-of-Use rate plan. On TOU-D-4-9PM it charges 59 cents per kWh during summer weekday on-peak hours (4-9pm) and 33 cents during summer weekday off-peak hours (per SCE's rate page, checked October 7, 2026). Most new SCE residential customers are automatically placed on this plan.