Time-of-Use Rates for Solar

Time-of-use rates for solar can either improve your savings or quietly reduce them, depending on when your home produces electricity and when you use it. If you have solar, or you are planning a system, understanding peak and off-peak pricing matters just as much as panel size. The key question is simple: are you using or storing energy when rates are highest, or buying power from the grid at the most expensive times?

For many homeowners, a time-of-use solar plan changes the math. Solar often generates most of its power in the middle of the day, while utility peak prices may happen in the late afternoon or evening. That mismatch is why the right strategy may include load shifting, battery storage, EV charging schedules, and a careful look at your utility plan. Below, you’ll learn how solar time of use rates work, when electricity is usually cheapest, and how to get better value from your system. If you present these concepts to customers, see how to write a solar sales proposal that explains rate plans, usage profiles, and TOU savings.

How time-of-use rates work with solar

A time-of-use rate, often shortened to TOU, means your electricity price changes based on the time of day and sometimes by season. Instead of paying one flat rate for every kilowatt-hour, you pay different prices during peak, off-peak, and sometimes mid-peak periods.

With solar, this matters because your panels do not produce the same amount of energy all day. Most systems generate the most electricity from late morning to mid-afternoon. But many utilities set their highest prices later in the day, when solar production starts falling and household demand rises. That creates a timing gap between when your system produces energy and when electricity costs the most.

In practice, time of use with solar means your savings depend on more than total annual production. They also depend on:

• when your panels generate electricity
• when your household uses the most power
• whether you export excess solar to the grid
• how your utility credits exported electricity
• whether you have a battery to store daytime production

This is why two homes with similar solar systems can see very different bills under the same utility. A homeowner who runs appliances during solar production hours may benefit more than one who uses most energy after sunset.

What are peak and off-peak hours?

Peak hours are the times when electricity is most expensive. These are usually late afternoon and early evening, when people come home, turn on lights, cook dinner, run appliances, and use air conditioning or heating. Off-peak hours are the cheaper periods, often late at night, early in the morning, and sometimes weekends.

The exact schedule depends on your utility. Some plans also include mid-peak or super off-peak windows. In summer, peak pricing often lasts longer because cooling demand is higher. In winter, peak periods may shift earlier in the day.

If you want to understand your own time of use solar setup, check your utility tariff and billing statement. Look for:

• the hours labeled peak, off-peak, or mid-peak
• seasonal rate changes
• weekday versus weekend pricing
• solar export credit rules

When is electricity cheapest to use?

In most time-of-use plans, electricity is cheapest during low-demand periods, usually overnight and early morning. For many homes, that makes these the best times to run energy-intensive loads that do not need to happen immediately.

Common off-peak activities include:

• charging an EV
• running the dishwasher
• doing laundry
• heating water
• pre-cooling or pre-heating the home before peak pricing starts

If your utility has a solar time of use metering structure, the cheapest time to use electricity may also be the best time to charge a battery from the grid, depending on your plan and local rules.

Why your solar bill can still be high under TOU

Many homeowners expect solar to erase most of their bill, then get surprised when charges remain high. Under time-of-use rates for solar, that often happens because production and consumption do not line up.

Here is the common problem: your system exports excess power around midday when rates may be lower, but later you buy electricity back during expensive evening peak hours. Even if your total solar production looks strong, the bill impact may be weaker than expected.

Your bill may stay high if:

• most of your energy use happens after sunset
• your peak pricing window starts when solar output is dropping
• your export compensation is lower than the retail price you pay later
• air conditioning or heating drives heavy usage during peak hours
• your EV charges at the wrong time

This is also why people search for terms like pge solar time of use, pge time of use solar, sce time of use solar, and sdg&e solar time of use rates. The utility schedule matters. The same solar array can perform differently under different plans. If you need to address homeowner concerns about TOU‑driven export rates, handle NEM 3.0 objections.

How solar panels affect time-of-use savings

Solar can be very effective under TOU pricing, but only when you look beyond total production. The value of each kilowatt-hour depends on when it is generated and whether you use it yourself, store it, or export it.

During sunny midday hours, your panels may cover household loads directly. That is often the most efficient use of solar because you avoid buying grid power. If you produce more than you need, that extra power may go back to the grid for credits, depending on your utility rules. Later, when the sun goes down and peak prices arrive, you may need grid electricity again unless you reduced usage earlier or stored extra energy.

That means solar time of use planning is really about matching three things:

• solar production profile
• household usage profile
• utility rate schedule

For some homes, the best result comes from changing behavior. For others, the better solution is battery storage. In certain cases, system design choices such as panel orientation can also influence late-day production, though maximizing total annual generation is still often the first priority.

Net metering, net billing, and TOU credits

One of the biggest factors in time-of-use rates for solar is how your utility values exported electricity. Under some net metering structures, exported solar earns a credit tied closely to the retail rate at the time of export. Under net billing or reduced export compensation models, the value of that exported electricity may be significantly lower.

This difference changes the economics of a solar system. If midday exports are credited generously, daytime overproduction can still offset expensive later usage. If export credits are lower, self-consumption becomes more valuable, and battery storage becomes much more attractive.

When reviewing your utility plan, focus on these questions:

• Are exports credited at retail, avoided cost, or another formula?
• Does the export value change by time of day?
• Can credits offset peak-period imports one-to-one?
• Are there separate plans for solar customers?

This is where it’s crucial to explain net billing (NEM 3.0) in proposals. A small tariff difference can have a large impact on annual savings.

When a battery makes more sense with TOU solar

A battery can improve your savings under a time-of-use solar plan because it lets you keep lower-cost energy for later use. Instead of sending all excess daytime production to the grid, you can store some of it and use it during expensive peak hours.

That can help in several ways:

• you avoid buying electricity during the highest-priced periods
• you use more of your own solar production directly
• you reduce the impact of lower export compensation
• you gain backup power benefits if your system supports it

In some cases, a battery may even charge during cheap off-peak grid hours and discharge later when prices rise. Whether that strategy works depends on your local tariff, battery efficiency, and utility rules. The biggest gains usually happen when late afternoon and evening rates are much higher than midday export credits.

If you are comparing solar time of use options, battery economics improve when:

• peak rates are steep
• export rates are low
• your household uses a lot of power after sunset
• you want more control over EV charging or HVAC costs

Best ways to lower your bill on time-of-use solar rates

Shift flexible loads to cheaper hours

The simplest strategy is to move electricity use out of expensive peak windows. Run the dishwasher later, schedule laundry overnight, and charge your EV when rates are lowest. If you work from home, try to use major appliances while solar production is highest.

Use more of your solar directly

The more energy you consume while your panels are producing, the less electricity you need to buy from the grid later. That can mean running appliances during the day, timing pool pumps wisely, or pre-cooling the home before peak rates begin.

Reduce HVAC demand during peak periods

Heating and cooling often drive the highest usage when prices are also highest. A programmable or smart thermostat can help you lower demand during costly hours without making your home uncomfortable.

Schedule EV charging carefully

EVs can either help or hurt your TOU savings. Charging during off-peak periods is often far cheaper than charging during evening peaks. Some homes may benefit from charging from daytime solar on weekends or work-from-home days, while others save more with overnight charging.

Review your rate plan regularly

Your utility may offer multiple TOU structures, and the best one can change as your usage changes. Adding an EV, a battery, or even a change in work schedule can alter which plan is most favorable.

Smart home tools that help with TOU optimization

You do not need a full home automation system to improve TOU savings, but the right tools can make it much easier to stick to a lower-cost schedule. Useful options include:

• smart thermostats that reduce HVAC use during peak periods
• smart plugs and appliance timers
• EV charging schedules
• energy monitoring apps that show usage by hour
• battery systems with automated charge and discharge settings

These tools are especially useful if your household cannot manually manage every appliance each day. Automation helps you follow the plan without constant effort.

Utility-specific solar TOU plans to watch closely

Not all rate structures are equal, which is why utility-specific searches are so common. Homeowners often look for pge solar time of use, pge time of use solar, sce time of use solar, or sdg&e solar time of use rates because each utility can set different peak windows, seasonal pricing, and export credit rules.

When comparing plans, review:

• peak hours and whether they shift by season
• the price gap between peak and off-peak rates
• how exported solar is credited
• whether a special EV or solar plan is available
• whether TOU is optional or required for solar customers

Do not assume the cheapest midday plan is always best for solar. In some cases, a plan with moderate peak pricing and better export treatment may perform better over a full year.

How to tell if a time-of-use solar plan is right for you

A TOU plan can be a good fit if you can shift usage, use more energy during daylight hours, or add a battery. It may be less favorable if most of your consumption happens during expensive evening periods and you have limited flexibility.

You are more likely to benefit if:

• you are home during the day and can use solar directly
• you can move EV charging and appliances to off-peak hours
• you have battery storage or plan to add it
• your utility offers fair export credits

You should review your usage more carefully if:

• your biggest loads happen after sunset
• your home relies heavily on evening air conditioning
• your export compensation is low
• your current bill shows heavy peak-hour usage

FAQ about time-of-use rates for solar

What is the cheapest time of day to use electricity?

Usually late at night, early morning, or other off-peak periods. The exact hours depend on your utility plan. Always check your tariff schedule because some plans also have cheaper weekend or super off-peak rates.

Why is my bill so high if I have solar?

Often because your home uses the most electricity when solar production is low and rates are high. If you export lower-value electricity during the day and buy expensive electricity in the evening, your bill can stay higher than expected.

Is solar still worth it with time-of-use rates?

Yes, often it is, but the savings depend on timing. Solar usually works best when you can use more of your production directly, shift consumption to daylight or off-peak periods, or pair the system with a battery.

Do batteries help more under TOU plans?

In many cases, yes. Batteries can store excess daytime solar and use it later during expensive peak periods. They become especially valuable when export compensation is lower than the retail rate you pay at night.

Do all utilities handle solar TOU rates the same way?

No. Utilities vary widely in peak hours, seasonal pricing, export credits, and customer eligibility rules. That is why utility-specific research matters before choosing a plan or sizing a system.

Can EV charging improve my TOU savings?

Yes, if you charge during off-peak hours or align charging with excess daytime solar. Charging at the wrong time, especially during evening peaks, can noticeably increase your bill.

What should I check before choosing a solar TOU plan?

Look at your utility rate schedule, your hourly usage pattern, export compensation rules, seasonal peak windows, and whether modeling time-of-use and demand charges in proposals would improve your economics. The best plan depends on how your home actually uses energy, not just on the advertised lowest rate.