Utility & Grid
Solar and Time-of-Use Rates: Why When You Use Power Matters
Learn how time-of-use electricity rates can change the value of solar, exports, batteries, and household load shifting.
Quick answer
Under time-of-use rates, electricity can cost different amounts at different hours. Solar value depends not only on annual production, but on when the home uses, stores, imports, and exports electricity.
A kWh can have different value by hour
Time-of-use plans set prices by time window. A proposal should identify the applicable tariff and avoid treating every kilowatt-hour as if it has the same price or export credit.
Self-consumption can matter
Using solar while it is produced can avoid a grid purchase at that moment. Exports may receive different compensation, so household timing and battery behavior can affect modeled value.
Rate plans can change
Utilities update tariffs and eligibility. Verify your actual plan and current program documents rather than relying on a generic statewide number or an old screenshot.
Model the home, not a headline
Ask how the estimate treats time-of-use periods, fixed charges, exports, and future electric loads. Use a range and written assumptions before making a financial decision.
Research and review
Reviewed for plain-language accuracy, source links, and consistency with SolarSavings calculator assumptions.
Reviewed by SolarSavings.energy Research Desk
Last reviewed August 14, 2026
This is educational content, not tax, legal, engineering, or financial advice. Confirm current incentives, tariffs, and contract terms with the relevant provider or qualified professional.
Frequently asked questions
Does solar always save more on time-of-use rates?
Not automatically; the result depends on production timing, household usage, exports, and tariff rules.
Will a battery help under TOU?
It may shift energy between hours, but added cost and tariff assumptions need separate modeling.
Where do I find my rate plan?
Check your utility bill, customer portal, or the utility’s current tariff materials.
Primary sources
This guide was written for homeowners and reviewed against the following government and research resources. Programs and utility rules can change, so verify current details before making a financial decision.