The peak window from 4pm to 9pm can triple your electricity rate, instantly explaining why is my EV charging bill so high once you add an EV.
Step 1: Switch to the Right SCE Rate Plan
The first fix is moving to the TOU-prime rate. This plan keeps rates almost identical from 9pm until 4pm the next day, with only a one-cent difference. During the 4-9pm window the price jumps three times higher, so avoiding that block is essential for reduce EV electricity costs.
- Contact SCE and request the TOU-prime rate.
- Confirm your new plan starts before your next billing cycle.
- Update your Tesla app to respect the new off-peak window.
Step 2: Program Your Tesla to Charge After 9pm
Once the rate is active, simply tell your vehicle to charge EV after 9pm. The car will wait until the cheap period begins and finish before the expensive window opens again.
- Open the Tesla app and go to Charging settings.
- Set the scheduled charge start time to 9:00 PM.
- Enable “Charge to 80%” or your preferred limit so the car stops automatically.
Step 3: Use Powerwall Off Peak Savings
If you already own a Powerwall, the TOU-prime plan multiplies its value. The battery discharges during the costly 4-9pm hours and recharges after 9pm, giving you real Powerwall off peak savings.
- Open the Tesla app and select your Powerwall.
- Choose “Time of Use” mode and pick the SCE TOU-prime schedule.
- Set the reserve percentage so the battery has enough stored energy to cover your evening load.
For deeper details on Tesla Model Y PowerShare savings, check out this guide: https://denniscw.com/blog/tesla-model-y-powershare-savings-explained
Step 4: Get Professional Setup and Safety Checks
Many drivers try to handle the settings themselves and miss critical details. A trained installer can lock in the schedule, verify your panel can handle the load, and make sure everything stays safe.
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They also walk you through warranty registration so you never lose coverage.
Pro Tips for Maximum Savings
- Never override the schedule for a quick top-up between 4-9pm; the cost penalty is too high.
- Combine solar with the TOU-prime plan so excess daytime generation offsets any remaining usage.
- Review your SCE bill monthly for the first three cycles to confirm the new rate is working.
- If your Powerwall feels undersized, ask about adding a second unit only after confirming the TOU schedule is optimized.
Bottom Line
Switching to SCE time of use rates Tesla, setting your car to charge EV after 9pm, and letting the Powerwall handle the peak window cuts the main reason why is my EV charging bill so high. The changes are simple, the savings are immediate, and your EV finally becomes the cheap transportation it was meant to be.
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