Maximize Solar Savings With Time-of-Use Rates

Time-of-use (TOU) rates charge different electricity prices based on when you consume power, and solar installations can dramatically amplify your savings under these programs. By shifting your energy consumption to match peak solar production hours, you’ll take advantage of the lowest rates while maximizing the value of every kilowatt your panels generate. Understanding how TOU rates work with solar is the key to unlocking significant long-term financial benefits.

Understanding Time-of-Use Rate Structures

Time-of-use rates divide your day into distinct pricing periods, typically ranging from 2 to 4 different rate tiers. Most utilities implement:

• Off-peak hours: Usually late evening through early morning, offering the lowest rates (often 50% cheaper than peak)
• Partial-peak hours: Mid-morning and late afternoon, with moderate rates
• Peak hours: Typically 4 PM to 9 PM when demand is highest, charging premium rates

The timing varies by utility and region. California’s utilities, for example, shifted peak hours later in recent years to capture evening solar production from western-facing panels. Your specific TOU schedule is available directly from your utility company’s website or billing statement.

Solar installations are perfectly positioned to exploit this pricing structure because peak production hours—roughly 9 AM to 3 PM—often overlap with partial-peak or lower-rate periods. The solar energy you generate during these hours effectively displaces the most expensive electricity you’d otherwise purchase, creating substantial savings compared to homes on standard rate plans.

Strategic Appliance Scheduling Multiplies Benefits

While your solar panels automatically generate electricity when the sun shines, you can further maximize savings by strategically timing your household consumption around TOU rates and solar production patterns.

High-consumption activities to schedule during solar peak hours include:

• Running dishwashers and laundry machines
• Charging electric vehicles
• Operating pool pumps and water heaters
• Running HVAC systems for heating or cooling

Smart devices and programmable settings make this easier than ever. Most EV charging can be scheduled for mid-day hours when your panels produce maximum output. Pool pumps with timers can run during 11 AM to 2 PM windows. Even water heater settings can be adjusted to heat during solar production peaks, storing that thermal energy for later use.

This strategy works because you’re consuming electricity at the exact moment your solar system produces it—essentially using free solar power instead of paying peak-hour rates. The math is compelling: if peak rates cost 40¢ per kilowatt-hour and you shift just 10 kWh daily to solar hours instead, you’ll save $4 daily or roughly $1,460 annually.

Combining Solar With Battery Storage

Battery storage systems take TOU optimization to the next level by allowing you to store solar energy generated during low-rate or off-peak hours and use it during peak pricing periods. This creates a powerful financial arbitrage opportunity.

When paired with solar, a battery system can:

• Capture excess midday solar production that exceeds your real-time consumption
• Release that stored energy during peak-rate hours (typically evening), avoiding the highest rates
• Provide backup power during outages, adding resilience value
• Enable you to take full advantage of time-of-use rate savings even when you’re away during peak solar hours

Battery economics have improved significantly, with costs declining over 70% in the past decade. On TOU rates, a battery system pays for itself faster because you’re capturing the full price differential between cheap solar hours and expensive peak hours. Some utilities even offer rebates for battery installations, further improving the payback period.

The key consideration is matching your battery capacity to your peak-hour consumption. Oversizing batteries adds cost without proportional benefit, while undersizing limits optimization potential. Your electricity usage patterns during peak hours determine the ideal battery size for maximum ROI.

Use Our Solar Calculator to Estimate Your TOU Savings

Every home’s situation is unique based on local utility rates, solar potential, consumption patterns, and available incentives. To calculate your specific payback period and long-term savings under time-of-use rates, use our solar ROI calculator, which accounts for your local TOU rate structure, current tax credits, and state-specific rebates.

The calculator helps you model different scenarios, including optional battery storage, to see exactly how much you’ll save with solar on your utility’s TOU program. Enter your monthly consumption, peak-hour usage patterns, and local rates for an accurate projection of your investment timeline and returns.

Frequently Asked Questions

Do all utilities offer time-of-use rates?

Not all utilities offer TOU rates as a standard option, though it’s becoming increasingly common as grid demands shift. Some utilities require it for all customers, while others offer it as an optional plan. A growing number mandate TOU enrollment for solar customers specifically to better align consumption with production. Contact your utility directly to confirm whether TOU rates are available and whether you’re already enrolled. You can also check your billing statement to see if your rates vary by time period.

Can I switch back to standard rates if TOU doesn’t work for me?

Most utilities allow customers to switch between rate plans, though some impose waiting periods (typically 12 months) before you can change again. Before installing solar, request a detailed comparison of your potential costs under both standard and TOU rates. Homes with flexible consumption patterns and the ability to shift loads toward solar production hours benefit most from TOU. If your household operates rigid schedules with heavy evening consumption, standard rates might remain optimal despite solar installation.

How does net metering interact with time-of-use rates?

Net metering credits excess solar production back to the grid, but the credit value depends on your rate plan. On TOU rates, excess solar generated during low-rate midday hours typically receives a lower credit value than electricity you’d have purchased at peak rates. This makes battery storage or consumption shifting even more valuable—you’re better off using your solar generation directly during peak hours rather than exporting it for a lower credit. Some utilities offer special net metering rates that vary by time period, further rewarding direct consumption over export.