SCE Rate Optimization Guide

How to Optimize Your Solar Panels with SCE Time-of-Use Rates in 2026

Adrian Marin
Adrian Marin|Independent Solar Advisor, Temecula CA

Helping Riverside County homeowners navigate SCE rates and solar options since 2020

The same kilowatt-hour that costs you $0.55 at 6pm costs only $0.15 at noon. For a Temecula solar homeowner, that spread is the entire game. This guide explains how SCE time-of-use pricing works, which rate plan saves the most under NEM 3.0, and the specific strategies that shift your home's energy consumption to the hours when solar is producing and rates are cheap.

Updated May 2026 | Applies to SCE territory including Temecula, Murrieta, Menifee, and Riverside County

What Time-of-Use Pricing Means for a Temecula Solar Homeowner

SCE does not charge a flat rate for electricity. What you pay per kilowatt-hour depends on when you use it. Under the TOU rate schedules that apply to almost all solar customers in 2026, the price of electricity swings dramatically based on the hour of day and the season.

Here is the concrete example that makes the stakes clear. Under TOU-D-PRIME, SCE's primary rate plan for NEM 3.0 solar customers, a kilowatt-hour consumed at noon on a weekday in July costs approximately $0.15. The same kilowatt-hour consumed at 6pm on the same weekday costs approximately $0.55. That is a 3.7x price difference for energy used six hours apart.

Now connect that to solar production. A south-facing 8 kW solar array in Temecula produces its maximum output between 10am and 2pm, exactly the window when electricity rates are cheapest. The grid demand peak, and therefore the highest electricity rates, hits from 4pm to 9pm, after solar production has dropped to near zero.

This timing mismatch is the central challenge of solar optimization under SCE time-of-use pricing. Solar produces most during cheap hours. You consume most during expensive hours. Every kilowatt-hour you shift from the expensive window to the cheap window saves you the difference, and that difference is substantial.

For a household spending $3,000 per year on electricity before solar, the split between peak and off-peak consumption determines how much of that bill actually disappears after going solar. A home that shifts 30 percent of its peak load to midday can eliminate $400 to $600 more annually than a home that makes no behavioral changes after installation.

Key Insight for Temecula Homeowners

Solar panels cut your daytime electricity cost to near zero. TOU optimization cuts your nighttime and evening cost by shifting as many loads as possible into the window when solar is producing. The combination is what makes the economics work under NEM 3.0.

The strategies in this guide focus on three levers: knowing which rate plan gives solar homeowners the best structure, scheduling your high-draw appliances into solar production hours, and using battery storage to bridge the gap between solar production and evening demand.

SCE TOU Rate Plans for Solar Customers in 2026: Full Rate Tables

NEM 3.0 solar customers in SCE territory have three primary TOU rate plan options. Each has a different peak window and rate structure. The right choice depends on when your household draws power from the grid. Here are the 2026 rate structures for each plan.

TOU-D-PRIME (Default for Most NEM 3.0 Solar Customers)

TOU-D-PRIME is the default rate plan for new NEM 3.0 solar interconnections in SCE territory. It is designed to align with solar production patterns, with the lowest rates during the hours when solar arrays generate the most power.

Time PeriodHoursSummer Rate (Jun-Sep)Winter Rate (Oct-May)
On-Peak4pm to 9pm, Mon-Fri~$0.55/kWh~$0.37/kWh
Mid-Peak9am to 4pm and 9pm to 10pm, Mon-Fri~$0.28/kWh~$0.22/kWh
Super Off-Peak9am to 2pm, weekends and holidays~$0.13/kWh~$0.13/kWh
Off-Peak10pm to 9am, all days~$0.15/kWh~$0.13/kWh

Rates are approximate as of Q1 2026 and include all applicable delivery, generation, and baseline adjustments. Actual rates vary by baseline allocation and usage tier. Confirm current rates at sce.com.

TOU-D-4-9PM (Alternative for Evening-Heavy Households)

TOU-D-4-9PM uses the same 4pm to 9pm peak window but has a slightly different rate structure that benefits households with significant loads after 9pm. If your family runs the dishwasher, does laundry, or uses high-draw electronics primarily after 9pm, this plan can produce lower annual bills than TOU-D-PRIME for some usage patterns.

Time PeriodHoursSummer RateWinter Rate
On-Peak4pm to 9pm, Mon-Fri~$0.52/kWh~$0.35/kWh
Off-PeakAll other hours~$0.17/kWh~$0.14/kWh

TOU-D-5-8PM (Best for Households That Can Avoid 5pm to 8pm Only)

TOU-D-5-8PM has a shorter, tighter peak window from 5pm to 8pm Monday through Friday. This plan is advantageous for households that cannot avoid all peak usage from 4pm to 9pm but can consistently avoid the 5pm to 8pm core. Homeowners who typically eat dinner early, run appliances before 5pm or after 8pm, and have moderate evening loads may find this plan the most forgiving.

Time PeriodHoursSummer RateWinter Rate
On-Peak5pm to 8pm, Mon-Fri~$0.47/kWh~$0.33/kWh
Off-PeakAll other hours~$0.16/kWh~$0.13/kWh

Rate Plan Selection Tip

Use SCE's Rate Comparison Tool at sce.com with your actual 12-month usage history before changing plans. The tool shows which schedule would have produced the lowest bill over the past year based on your real interval data. This is more reliable than any general rule of thumb because household schedules vary widely.

How NEM 3.0 Changed the TOU Calculus Entirely

To understand the TOU optimization strategies in this guide, you need to understand what NEM 3.0 did to solar economics in SCE territory starting April 2023. The change was fundamental, not incremental.

Under NEM 2.0, which still applies to solar systems interconnected before April 2023, excess solar power exported to the grid earned credits at near-retail rates. A solar homeowner exporting energy at 1pm during peak summer billing would earn credits worth roughly $0.35 to $0.45 per kWh. Those credits offset evening peak imports at similar rates. The math was roughly one-to-one, which made exporting solar a clean financial play.

Under NEM 3.0, export rates were restructured as flat avoided cost credits worth approximately $0.05 per kWh. The time of day you export no longer affects what credit you earn. Exporting during peak hours earns the same as exporting at midnight: about five cents per kilowatt-hour.

This single change eliminated the time-value of solar exports entirely. Sending power to the grid and buying it back during peak hours became a losing trade of $0.05 credited versus $0.55 charged, a ratio that destroys solar ROI if most of your production gets exported.

The NEM 3.0 Export Math

  • You export 1 kWh at 1pm. SCE credits you: approximately $0.05
  • You import 1 kWh at 6pm. SCE charges you: approximately $0.55
  • Net cost of that round-trip: approximately $0.50 per kWh

The entire TOU optimization strategy shifted as a result. Under NEM 2.0, the game was partly about managing when you exported. Under NEM 3.0, the game is exclusively on the import side. Every strategy in this guide targets one goal: eliminate or minimize grid imports during the 4pm to 9pm peak window when rates are $0.44 to $0.55 per kWh.

The value of self-consumption also changed. Under NEM 2.0, self-consuming solar was roughly equivalent to exporting it because both routes captured near-retail rate value. Under NEM 3.0, self-consuming solar is dramatically more valuable than exporting it: self-consumption avoids a $0.15 to $0.55 purchase depending on the hour, while exporting earns only $0.05. The avoided-import value of self-consumption is 3x to 11x the export credit value.

For homeowners with existing NEM 2.0 systems, this guide's strategies still apply but with less urgency. Your export rates remain more favorable, which reduces the penalty for not optimizing. If you are on NEM 3.0 or planning a new solar installation in 2026, these strategies are not optional extras. They are the core of the financial case for solar.

TOU Optimization Without a Battery: Midday Appliance Load-Shifting

You do not need a battery to benefit from TOU optimization. The cheapest and most immediate strategy is rescheduling your high-draw household appliances to run during solar production hours, between approximately 9am and 3pm on weekdays. This is load-shifting, and it costs nothing to implement.

The principle is simple. Your solar array generates electricity during midday hours when SCE rates are lowest. If a high-draw appliance like a dishwasher, washer, or dryer runs during that window, it consumes solar energy directly and reduces the total energy your system exports at the low NEM 3.0 rate of $0.05 per kWh. Every kWh of appliance load you shift from evening peak into solar production hours saves you the $0.40 to $0.50 import-export spread.

Appliances to Shift and Estimated Daily Savings

ApplianceTypical DrawCycle EnergyAnnual Savings if Shifted
Dishwasher1,200 to 1,800W1.2 to 2.0 kWh$60 to $120
Clothes washer500 to 1,000W0.5 to 1.0 kWh$40 to $90
Electric clothes dryer4,000 to 6,000W3.0 to 5.0 kWh$120 to $250
Pool pump (variable speed)250 to 1,500W1.5 to 4.0 kWh/day$200 to $500
Pool heater (heat pump)4,000 to 6,000W4.0 to 10.0 kWh/day$300 to $800
EV charging (Level 2)7,200 to 11,500W10 to 30 kWh/session$400 to $1,200

Annual savings estimates assume 250 cycles per year for cycling appliances, 180 days of pool pump operation, and 200 charging sessions for EV. Savings reflect the $0.40 per kWh average spread between peak import rates and midday self-consumption rates.

The pool pump is often the single largest TOU optimization opportunity for Temecula homeowners. A pool pump running 8 hours per day on a standard schedule may run from 8pm to 4am, squarely in the off-peak window but not during solar production. Shifting it to 9am to 5pm costs nothing beyond a setting change on the pump's timer and moves 2 to 6 kWh per day into solar-offset hours.

For appliances you cannot shift manually because household schedules do not allow it, smart home controls and delay-start features are the solution. Most modern dishwashers have a delay-start button. Setting it each night to begin the cycle at 10am adds 30 seconds to your evening routine and saves $80 to $120 per year.

The TOU Plus Battery Strategy: Charge Midday, Discharge at Peak

Adding a battery to a solar system transforms TOU optimization from a behavioral practice into an automated financial engine. Instead of manually rescheduling every appliance, the battery automatically captures midday solar production and releases it during the evening peak when grid rates are highest.

The mechanism is straightforward. During solar production hours, your panels generate more power than the home immediately consumes. Without a battery, that surplus exports to the grid at roughly $0.05 per kWh under NEM 3.0. With a battery, that surplus charges the battery instead. When evening arrives and solar production drops, the battery discharges into the home, offsetting grid imports that would otherwise cost $0.44 to $0.55 per kWh.

The value of each kilowatt-hour stored and self-consumed is the full import rate avoided, approximately $0.44 to $0.55 during peak hours. Compare this to the $0.05 export credit that kilowatt-hour would have earned if it went to the grid. The difference, roughly $0.39 to $0.50 per kWh, is the battery's daily productivity for each cycle.

How Battery Discharge Mode Settings Work

Modern home batteries from Tesla, Enphase, and other manufacturers allow you to configure when the battery charges and when it discharges. For TOU optimization under SCE rates, the optimal settings are:

The Tesla app calls this operating mode "Time-Based Control." The Enphase app calls it "Savings Mode." Both allow you to define the peak hours when the battery should prioritize discharging into the home before drawing from the grid.

On TOU-D-PRIME, the battery should begin discharging at 4pm and discharge through 9pm. If the battery fully discharges before 9pm, the home draws from the grid for the remainder of the peak window. On summer days with high AC usage, a 13.5 kWh battery may run out by 7pm or 8pm. On mild days, it carries through the full 5-hour peak window without grid imports.

Real Savings Math: A 10 kWh Battery at TOU-D-PRIME Rates

The battery arbitrage case is often presented with theoretical maximum numbers. Here is honest math using conservative assumptions for a Temecula homeowner.

Scenario: 10 kWh Battery, TOU-D-PRIME, Temecula Home

Battery usable capacity10.0 kWh
Round-trip efficiency (typical)90%
Effective discharge per cycle9.0 kWh
Average peak rate avoided (summer weighted)$0.47/kWh
Value avoided per cycle$4.23
Estimated full-cycle days per year (real-world)290 days
Partial-cycle adjustment factor0.82
Estimated annual savings from peak avoidance$1,006

Adding the self-consumption value: solar power that would have been exported at $0.05 per kWh is instead stored and used at the equivalent of $0.28 per kWh in mid-peak savings and $0.47 per kWh in on-peak savings. For a well-sized 7 to 8 kW solar system in Temecula, the battery captures 4 to 6 kWh of solar surplus per day that would otherwise export at the low NEM 3.0 rate.

Self-Consumption Value Added

Solar surplus captured by battery instead of exported4.5 kWh/day avg
Value if exported (NEM 3.0 rate)$0.05/kWh
Value when self-consumed (import avoided at mixed rate)$0.38/kWh avg
Incremental value per kWh captured$0.33/kWh
Solar self-consumption days per year270 days
Additional annual value from self-consumption$401
Combined annual savings estimate (10 kWh battery, Temecula home)$1,407

This is a conservative real-world estimate, not a manufacturer maximum. Actual results vary based on roof orientation, system size, household consumption pattern, and seasonal variation in Temecula weather.

At $1,407 per year in combined savings, a 10 kWh battery installed at $12,000 before incentives pays back in approximately 8.5 years without any incentives. After the 30% federal Investment Tax Credit reduces net cost to $8,400, payback is approximately 6 years. With SGIP added, payback shortens further.

These numbers represent the TOU arbitrage and self-consumption value only. They do not include the backup power value that a battery provides during SCE Public Safety Power Shutoffs, which Temecula has experienced multiple times. For homeowners in High Fire Threat District areas, the backup value is real even though it does not appear in a financial model.

Smart Appliances and TOU: Automating Your Load Shifts

Manual appliance scheduling works, but it requires daily attention and breaks down when household routines shift. Smart appliances and controllers automate TOU load-shifting so it happens consistently without behavioral effort.

Smart Thermostats: Nest and Ecobee for Pre-Cooling

Both Nest (Google) and Ecobee thermostats support TOU scheduling. You can program the thermostat to pre-cool aggressively from 11am to 3:30pm using cheap solar power, then hold a higher temperature setpoint during the 4pm to 9pm peak window. The Ecobee also supports direct integration with utility rate plans in some markets, and its "Smart Recovery" feature automatically calculates how early to start cooling to reach a target temperature by a specified time.

For Temecula, program your thermostat to:

This schedule can reduce AC-related peak imports by 40 to 70 percent depending on home insulation quality, outdoor temperature, and how cool you pre-set the home.

Smart EV Chargers: Emporia Vue and Wallbox

Standard Level 2 EV chargers draw 7.2 to 11.5 kW continuously. That load during peak hours is catastrophic for a TOU bill. Smart EV chargers solve this by allowing you to program charging windows that avoid peak hours entirely.

Emporia Vue Level 2 charger integrates with the Emporia app and can be programmed with SCE TOU rate schedules. It charges only during the hours you designate as off-peak or solar, and it will pause charging automatically if peak hours begin before a scheduled session completes. Wallbox chargers offer similar scheduling features with a clean mobile interface and support for OCPP protocol, which allows integration with home energy management systems.

Both support solar-direct charging modes, where the charger dynamically adjusts its draw based on live solar production data, consuming only the solar surplus that would otherwise export to the grid at the low NEM 3.0 rate.

Smart Pool Controllers: Pentair IntelliConnect and Hayward OmniHub

For the many Temecula homeowners with backyard pools, the pool pump is a major energy draw and a prime TOU optimization target. Variable-speed pumps use 50 to 90 percent less energy than single-speed pumps and can be throttled up or down based on time of day.

Pentair IntelliConnect and Hayward OmniHub both offer remote scheduling that lets you set the pump to run at high speed during solar production hours (9am to 3pm) and throttle down or stop during evening peak hours. If your pool also has a heat pump, scheduling it to heat between 10am and 2pm when solar production is highest and rates are cheapest can save $300 to $800 annually depending on how aggressively you heat the pool.

The Pre-Cooling Strategy for Temecula Summers

Temecula summers are genuinely hot. High temperatures from late June through September regularly reach 95 to 105 degrees Fahrenheit, and some homes without good insulation or shade can see interior temperatures climb quickly when the AC is throttled back during the evening peak window.

The pre-cooling strategy works by using the thermal mass of your home as free energy storage. Your walls, floors, furniture, and even the air volume in your home can absorb cooling and hold it for several hours. By cooling the home more aggressively during cheap solar hours, you deposit cooling capacity that releases slowly during the expensive peak window when the AC is running less.

The practical schedule for a Temecula home with 2,000 square feet and moderate insulation:

10am to 12pm:Solar production climbing. Set AC to 72 degrees. Begin pre-cooling at low cost.
12pm to 3:30pm:Peak solar production. Set AC to 69 to 70 degrees. Active pre-cooling at near-zero net cost.
3:30pm to 4pm:Raise setpoint to 74 to 76 degrees. Home holds cool temperature as solar production tapers.
4pm to 9pm:Peak rates in effect at $0.47 to $0.55/kWh. Setpoint at 76 to 78 degrees. Thermal mass limits AC runtime.
9pm to 10am:Off-peak rates. Return to comfort setpoint at $0.13 to $0.17/kWh.

How long the pre-cooling effect lasts depends on your home's insulation quality, the outdoor temperature differential, and how cool you pre-set the home. In Temecula homes with double-pane windows and reasonable attic insulation, a 69-degree pre-cool at 2pm can maintain indoor temperatures below 76 degrees until approximately 7pm even when outdoor temperatures are in the mid-90s. In homes with single-pane windows or poor attic insulation, the effect may only last 2 to 3 hours.

Pre-cooling does increase your midday solar consumption, which is exactly the goal under NEM 3.0. Every kWh your AC uses at noon is solar power self-consumed at the equivalent of $0.28 per kWh in avoided imports, rather than exported at $0.05 and bought back at $0.55.

The Summer Peak Penalty: Calculating Your Personal TOU Exposure

SCE's summer peak rates on TOU-D-PRIME reach approximately $0.55 per kWh during the on-peak window from 4pm to 9pm, June through September. This is the highest electricity rate most residential customers in the country pay, and it directly determines how much TOU optimization is worth for your household.

To calculate your personal summer peak exposure, you need your interval usage data from SCE. Log in to sce.com, navigate to My Account, and download your hourly or 15-minute interval data for the most recent June, July, and August. This data shows exactly how many kilowatt-hours your home drew from the grid during each hour of every day.

Sum the kWh consumed between 4pm and 9pm across all weekdays in those three months. That is your summer peak exposure in kilowatt-hours. Multiply by $0.55 to get the approximate dollar cost of your summer peak consumption.

Summer Peak Exposure Calculator Example

Average peak-hour grid draw (4pm to 9pm)3.5 kWh/hour
Peak hours per day (Mon-Fri only)5 hours
Weekdays in June, July, Augustapproximately 65 days
Total summer peak kWh1,138 kWh
Summer on-peak rate$0.55/kWh
Summer peak cost (this household)$626

For the household in this example, the summer peak window alone costs $626 over three months, or about $209 per month in just peak-hour charges. This is the upper bound on what TOU optimization strategies can save from summer peak alone.

In practice, no optimization strategy eliminates all peak consumption. Cooking dinner, running house lights, watching television, and managing occupant comfort all generate some peak draw that cannot be shifted. A realistic summer peak reduction of 50 to 70 percent is achievable with a battery plus pre-cooling, saving $313 to $438 from summer peak charges in this example.

How to Read Your SCE Bill to Identify TOU Exposure

Your SCE bill contains the data you need to quantify your current TOU exposure and calculate how much a battery would save. Most homeowners never read past the total due amount. The itemized usage section is where the insight lives.

Finding Your Peak Usage Charges

On a TOU bill, SCE itemizes energy charges by time period. Look for line items labeled "On-Peak," "Mid-Peak," and "Off-Peak" or similar language specific to your rate plan. Each line shows the kilowatt-hours consumed in that period and the rate applied. Your on-peak line is the number to focus on.

For NEM 3.0 solar customers, the bill also shows energy exported and the avoided cost credits applied. You will see a section showing how many kWh were exported and the credit amount. Dividing the credit amount by the exported kWh confirms the export rate you are receiving. For NEM 3.0 customers in 2026, this should be in the $0.04 to $0.07 range.

Using SCE Interval Data to Size a Battery

Interval data from sce.com shows your hourly consumption in 15-minute or 60-minute increments. Download 12 months of interval data and calculate the average kWh you import from the grid between 4pm and 9pm on weekdays. That average is your daily peak exposure. A battery sized to cover 80 to 100 percent of your daily peak draw eliminates most peak-hour charges.

For example, if your interval data shows average daily peak imports of 8 kWh, a 10 kWh battery (with 90 percent round-trip efficiency yielding 9 kWh effective discharge) covers your typical peak demand. You will still draw from the grid on high-AC days or days with guests, but the average case is covered.

If you want to request this analysis before buying a battery, any reputable solar and storage installer in Temecula can pull your interval data with your permission and model the battery savings projection against your actual usage history.

Choosing the Right TOU Rate Plan: SCE's Rate Comparison Tool and What It Tells You

The difference between TOU-D-PRIME, TOU-D-4-9PM, and TOU-D-5-8PM can translate to $100 to $400 per year for a solar household. The right choice is not generic. It depends on when your household actually draws from the grid after solar production is subtracted.

SCE's Rate Comparison Tool at sce.com uses your actual 12-month interval data to calculate what you would have paid under each eligible rate plan. The tool is free, takes about 5 minutes, and produces a clear dollar comparison across all plans you qualify for. This is the only reliable way to choose between TOU plans.

Common patterns that favor specific plans:

One important note: if you are on NEM 3.0, you must stay on a TOU rate plan. SCE does not offer a flat rate option for NEM 3.0 customers. The choice is which TOU plan, not whether to use TOU pricing.

SCE allows one free rate plan change per 12-month billing period. Make your change after running the Rate Comparison Tool and reviewing at least 6 months of post-solar interval data. Changing plans too soon, before your solar system has produced a full seasonal cycle, can produce misleading comparisons because summer and winter production differ significantly.

SCE Billing Cycle and True-Up: How TOU Affects Annual Net Billing

NEM 3.0 solar customers on SCE receive monthly bills that show net energy charges but do not settle the solar credit balance until the annual true-up. Understanding how TOU affects the true-up calculation is critical for managing expectations about your annual solar savings.

Each month, SCE calculates the energy you imported from the grid at the applicable TOU rate and subtracts the avoided cost credits for energy you exported. If your monthly solar production exceeds your consumption, you build a credit balance that carries forward. At the annual true-up, the accumulated credit or debit is settled.

The TOU structure creates an asymmetric true-up dynamic. Imports during peak hours cost $0.44 to $0.55 per kWh and run up your debit balance quickly in summer months. Exports during any hour credit only $0.05 per kWh and accumulate slowly. A solar system that exports generously all year but fails to offset peak-hour imports still faces a significant true-up bill.

The optimization target for true-up is not exporting as much solar as possible. It is avoiding peak-hour imports as much as possible. A household that exports 8,000 kWh per year but imports 3,000 kWh during peak hours will owe:

Export credits (8,000 kWh x $0.05)$400 credit
Peak import charges (3,000 kWh x $0.50 avg)$1,500 debit
Net true-up balance owed$1,100

This scenario illustrates why a large solar array without a battery can still produce a large true-up bill under NEM 3.0. The solar is producing, but the production happens at the wrong time relative to peak consumption.

TOU optimization strategies, whether through appliance scheduling, battery storage, or behavioral shifts, directly reduce the peak import portion of the true-up calculation. Cutting peak imports by 2,000 kWh at $0.50 average saves $1,000 at true-up, which is the most direct path to a near-zero true-up balance.

Winter vs Summer TOU: How Solar Production Aligns Differently

The TOU optimization challenge is primarily a summer problem in Temecula. Winter creates a different dynamic that is worth understanding so you can adjust strategies seasonally.

Winter TOU Rate Differences

Winter on-peak rates under TOU-D-PRIME are approximately $0.37 per kWh versus $0.55 in summer. The peak window remains 4pm to 9pm Monday through Friday. The off-peak rate drops to about $0.13 per kWh. The spread between peak and off-peak narrows in winter, which reduces but does not eliminate the value of TOU optimization.

How Winter Solar Production Changes the Calculus

Winter solar production in Temecula is lower than summer for two reasons. Shorter days reduce total production hours. Lower sun angles reduce the efficiency of panels, particularly those tilted for summer optimization. An 8 kW system producing 45 kWh per day in July may produce 25 kWh per day in January.

Additionally, winter in Temecula brings earlier sunsets. The 4pm to 9pm peak window in December begins when the sun is very low on the horizon, meaning solar production has largely stopped by the time peak rates begin. Battery storage therefore becomes even more important in winter because there is less late-afternoon solar to offset the beginning of the peak window.

Heating loads in winter also shift the equation. If your home uses an electric heat pump for heating, winter heating loads during the peak window are comparable to summer AC loads. Gas-heated homes have lower winter peak exposure from HVAC. Understand your winter heating fuel before calculating winter TOU exposure.

Pre-cooling strategy does not apply in winter, but a complementary pre-heating strategy can reduce peak-hour heat pump runtime: run the heat pump to warm the home to 70 or 71 degrees before 4pm using off-peak or solar power, then let the setpoint drift to 66 or 67 degrees during the peak window. Thermal mass holds warmth for 2 to 4 hours before the home needs supplemental heat.

EV Charging Strategy Under SCE TOU Rates

An electric vehicle is one of the highest-draw appliances in a modern home. A Level 2 EVSE (EV Supply Equipment) rated at 48 amps draws 11,520 watts continuously. Running that load during the SCE peak window at $0.55 per kWh costs $6.34 per hour. Charge for 3 hours during peak and you have added $19 to your electricity bill for that single session.

Never charge your EV during the 4pm to 9pm peak window under any SCE TOU plan unless unavoidable. This is the highest-impact single rule for Temecula EV owners under TOU pricing.

Two Optimal EV Charging Windows

Solar Midday Charging (10am to 2pm)

If your EV is home during the day, solar midday charging is the optimal option. Your panels produce at peak output, the rate is the lowest of any grid-import period, and EV charging maximizes self-consumption of solar that would otherwise export at $0.05 per kWh. A 30-mile round trip (approximately 10 kWh) charged from solar costs near zero in net terms under NEM 3.0.

Deep Overnight Charging (Midnight to 6am)

When solar midday charging is not available because the EV is at work, deep overnight charging at $0.13 to $0.15 per kWh is the second-best option. Set your EV or smart charger to begin charging at midnight. Avoid the 4pm to 9pm window on the way home and do not plug in immediately upon arrival.

EV Charging and Battery Interaction

If you have both a home battery and an EV, configure the battery to discharge during 4pm to 9pm for household loads rather than EV charging. Your home battery is too small to charge a car and handle household loads simultaneously. Let the battery offset household peak imports, and charge the EV separately on its overnight or midday schedule.

Some homeowners ask whether to charge the EV from the battery overnight. This is not optimal. Charging the battery from solar or off-peak grid and then charging the EV from the battery overnight introduces two round-trip efficiency losses (battery and EV onboard charger) rather than one. Direct off-peak or solar charging to the EV is always more efficient than routing through a home battery.

Monitoring TOU Performance: Enphase, SolarEdge, and SCE My Account

TOU optimization is not a one-time setup. It requires ongoing monitoring to verify that your strategies are working and to catch changes in household consumption patterns that might require adjustments.

Enphase Enlighten App

Enphase Enlighten shows solar production at the individual panel level, battery state of charge, home consumption, and grid import and export in a clear timeline view. For TOU optimization purposes, look at the daily timeline view and verify that battery discharge is occurring between 4pm and 9pm, that home consumption during peak hours is primarily battery-sourced rather than grid-sourced, and that the battery state reaches near-full by 3:30pm on days with adequate solar production.

The Enlighten self-consumption percentage metric is the most important single indicator. A well-optimized Enphase system with appropriately sized solar and storage should show self-consumption above 85 percent on typical weekdays.

SolarEdge mySolarEdge App

The SolarEdge mySolarEdge app provides production, consumption, and storage data with TOU period overlays if you configure your utility rate schedule in the app settings. The most useful view for TOU analysis is the energy flow diagram that shows real-time and historical energy routing: solar to home, solar to battery, battery to home, and grid to home. Any grid-to-home flow during peak hours is a TOU optimization opportunity.

SolarEdge's StorEdge (home battery) systems allow setting charge and discharge schedules based on TOU periods directly within the mySolarEdge interface. Confirm your charge start time is set to 9am or later on solar production days and discharge window is set to 4pm to 9pm.

SCE My Account: Green Button Data and Bill Analysis

SCE's online account portal at sce.com provides Green Button data downloads of your 15-minute interval usage data. Download your last 3 months of interval data monthly and review it in a spreadsheet to calculate your peak-hour imports for the period. Compare month over month to confirm that your load-shifting strategies are producing measurable reductions in peak-hour grid draws.

The SCE My Account dashboard also shows your current billing cycle's net charges broken down by time period. Monitoring the on-peak charges section each month gives you a real-time indicator of whether your TOU strategies are working before the annual true-up arrives.

Target metric: on-peak grid imports should be trending lower month over month after implementing optimization strategies, particularly in summer months when peak rates are highest. If peak imports are not declining, the issue is usually one of three things: the battery is not discharging at the right time, appliance load shifts are not actually occurring as scheduled, or household consumption is higher than the battery can cover.

Frequently Asked Questions About SCE TOU Rates and Solar Optimization

Which SCE TOU rate plan is best for solar homeowners in 2026?

TOU-D-PRIME is the best starting point for most NEM 3.0 solar homeowners in Temecula and Riverside County. It has the widest midday super-off-peak window (9am to 4pm) where solar production peaks and rates are lowest at roughly $0.13 to $0.17 per kWh. The evening peak from 4pm to 9pm runs $0.44 to $0.55 per kWh in summer, creating a strong incentive to self-consume solar or discharge battery storage during that window. Use SCE's Rate Comparison Tool at sce.com with 12 months of usage history to see which plan saves the most for your specific consumption pattern.

How do I switch my SCE rate plan to a solar-friendly TOU schedule?

Log in to sce.com, navigate to My Account, and select Rate Plan. SCE allows one free rate plan change per 12-month period. NEM 3.0 customers are automatically enrolled in TOU-D-PRIME at interconnection, but you can request a switch to TOU-D-4-9PM or TOU-D-5-8PM if an analysis shows it saves more for your usage pattern. The change typically takes effect on your next billing cycle. Run the Rate Comparison Tool first using your actual 12-month usage data to make an informed decision before switching.

What size battery do I need to cover the SCE peak period from 4pm to 9pm?

A typical 2,000 square foot Temecula home draws 1.5 to 3 kW during the evening hours from 4pm to 9pm. Over a 5-hour peak window that is 7.5 to 15 kWh of demand. A single 13.5 kWh battery or two Enphase IQ 5P units covers most evenings without grid imports. Homes with large central AC during the peak window, EV charging, or high-draw appliances during dinner preparation may need 20 kWh or more. Size based on your actual SCE interval data average for the 4pm to 9pm window, not your total daily usage.

When should I charge my EV to avoid SCE peak rates?

Never charge your EV during the SCE peak window from 4pm to 9pm. A Level 2 charger pulls 7.2 to 11.5 kW continuously, adding $1.70 to $2.70 per hour to your bill at peak rates. The two best charging windows are solar midday (10am to 2pm) when your solar array charges the car at near-zero net cost, or deep overnight (midnight to 6am) when off-peak rates drop to $0.13 to $0.17 per kWh. Set a charging schedule on your EV or smart charger app rather than plugging in when you arrive home.

What is the pre-cooling strategy for avoiding SCE peak rates in Temecula summers?

Pre-cooling means running your air conditioner to cool your home to 69 or 70 degrees Fahrenheit between noon and 3:30pm using cheap solar power, then setting the thermostat to 76 or 78 degrees at 4pm when peak rates begin. Thermal mass in your home holds the cool air for 2 to 4 hours before indoor temperature rises to uncomfortable levels. A smart thermostat like Nest or Ecobee can automate this schedule so it runs every weekday without manual adjustment. In a Temecula summer with temperatures in the high 90s, pre-cooling from a good starting temperature can reduce peak-hour AC consumption by 40 to 70 percent.

How does TOU rate timing affect my SCE annual true-up calculation?

Under NEM 3.0, your annual true-up calculates the net value of energy imported and exported across the full year. Imports during peak hours (4pm to 9pm) cost $0.44 to $0.55 per kWh against your balance. Exports in any period return only about $0.05 per kWh in avoided cost credits regardless of what time of day you export. This asymmetry means the true-up math strongly rewards reducing peak imports rather than increasing solar exports. Every peak-hour kWh you avoid by self-consuming battery storage or shifting load saves you $0.44 to $0.55 in true-up charges. Every additional kWh you export to the grid earns you only $0.05 credit regardless of the time of day.

How did NEM 3.0 change the TOU optimization strategy for solar homeowners?

Under NEM 2.0, solar homeowners could export excess midday power to the grid at near-retail rates and bank credits that offset expensive evening imports. TOU optimization under NEM 2.0 was partly about choosing when to export. Under NEM 3.0, export rates were set at approximately $0.05 per kWh as a flat avoided cost credit regardless of time of day. This eliminated the time-value of exports entirely. The entire TOU optimization strategy shifted from managing exports to eliminating peak imports through self-consumption, battery discharge, and appliance load shifting.

What time does the SCE peak period start and end, and does it apply on weekends?

On TOU-D-PRIME and TOU-D-4-9PM, the on-peak period runs from 4pm to 9pm Monday through Friday. Weekends and holidays use the off-peak or mid-peak rates, which are significantly lower. On TOU-D-5-8PM, the peak window is shorter, running from 5pm to 8pm Monday through Friday. Summer peak rates (June through September) are higher than winter rates (October through May) on all TOU plans. The summer on-peak rate under TOU-D-PRIME reaches approximately $0.55 per kWh versus $0.37 per kWh in winter.

See How Much You Can Save on SCE Peak Rates With Solar in Temecula

The strategies in this guide depend on your specific usage pattern, roof orientation, and current SCE rate plan. A proper solar and storage proposal for a Temecula home starts with 12 months of your interval data to identify your actual peak exposure and size the system around it.

We work with homeowners across Temecula, Murrieta, Menifee, Lake Elsinore, and Wildomar to design solar and battery systems around SCE TOU rates. We show you the actual peak-hour savings projection before you commit to anything.

Get Your TOU Solar Savings Estimate

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