If you pay an Xcel Energy bill in Colorado, your electricity no longer costs the same price all day long. Starting November 1, 2025, the Colorado Public Utilities Commission rolled out mandatory time of use (TOU) rates for all Xcel residential customers. That means the price you pay per kilowatt hour now depends on when you use electricity.
During peak hours, you are paying 2.7 times more than you pay during off peak hours. For homeowners without solar or battery storage, that price difference adds up fast. For homeowners who plan ahead, it creates an opportunity to lock in real savings every single month.
Here is how TOU rates work, what they actually cost you, and why solar panels paired with a home battery are the most effective way to take control of your electricity bill in 2026.
What Are Time of Use Rates and Why Did Colorado Adopt Them?
Time of use pricing is exactly what it sounds like. Instead of a flat rate for electricity no matter when you use it, your utility charges different prices based on the time of day. The goal is to encourage customers to shift energy use away from the hours when the grid is under the most stress.
Colorado adopted TOU rates because the grid faces growing strain between 5 PM and 9 PM on weekday evenings. That is when families come home from work, turn on air conditioning or heating, start cooking dinner, charge electric vehicles, and run appliances. Utilities have to fire up expensive and often fossil fuel powered peaker plants to meet that demand. By charging more during those hours, Xcel is trying to flatten that demand curve.
The Colorado Public Utilities Commission designed these rates to be revenue neutral. That means your bill should stay roughly the same if your usage patterns do not change. But here is the reality: most families cannot easily shift when they cook dinner, run the dishwasher, or keep the house comfortable. That is where solar and battery storage change the math entirely.
The Exact Numbers: What Xcel TOU Rates Cost in 2026
Here is the rate structure that went into effect for Xcel residential customers:
Peak Hours: 5 PM to 9 PM, Monday through Friday (excluding holidays)
Off Peak Hours: All other hours, including weekends and holidays
During summer months, on peak electricity costs approximately 21.3 cents per kilowatt hour. Off peak rates drop to roughly 7.9 cents per kilowatt hour. That is a spread of over 13 cents per kWh between the cheapest and most expensive electricity.
With Xcel also requesting an additional 9.9% rate increase that could take effect in August 2026, those peak hour prices are only heading in one direction. The average residential customer would see their monthly bill climb by nearly $10 per month under that proposal alone. Stack that on top of TOU peak pricing and the cost of doing nothing gets expensive quickly.
Learn more about Colorado solar incentives for 2026
Why Peak Hours Hit Colorado Families the Hardest
The 5 PM to 9 PM peak window is not some obscure time slot that is easy to avoid. It is the center of family life. Think about a typical weekday evening in a Colorado household.
You get home around 5:30 PM. The air conditioning or furnace kicks on because the house has been empty or in setback mode. You start preheating the oven for dinner. The kids are doing homework with lights on in multiple rooms. Someone plugs in their EV to start charging. The TV turns on. Laundry that did not get done over the weekend goes in.
Every one of those activities draws electricity at the highest rate of the day. Running a central AC unit for four hours during peak time costs roughly twice what it would cost to run it for the same duration on a Saturday afternoon. Charging an EV during peak hours versus overnight can mean an extra $30 to $50 per month depending on your driving habits.
The families who save money under TOU rates are the ones who can shift significant loads to off peak hours. That means running the dishwasher at 10 PM, doing laundry on weekends, and precooling the house before 5 PM. For some households, that kind of schedule juggling is manageable. For most, it is an inconvenience that only partially offsets the higher peak rates.
How Solar Panels Help (But Do Not Solve the Whole Problem)
If you have rooftop solar, your panels produce the most electricity between roughly 10 AM and 3 PM. Under the old flat rate structure, every kilowatt hour your panels generated was worth the same amount regardless of when it was produced. Under TOU rates, the value of your solar production depends on timing.
Here is the challenge: your panels produce the most power during midday hours, but those hours are now off peak. The electricity your panels generate at noon is being credited at the lower off peak rate. Meanwhile, the hours when electricity is most expensive (5 PM to 9 PM) are when solar production is dropping off or gone entirely, especially in winter when the sun sets by 5 PM.
This means solar alone does not fully capitalize on TOU rate savings. You are generating cheap electricity during the cheap hours and buying expensive electricity during the expensive hours.
That is exactly the problem a home battery solves.
Learn how grid-tie solar works in Colorado
Solar Plus Battery: The TOU Rate Optimization Strategy
A home battery paired with solar panels fundamentally changes how you interact with TOU pricing. Here is how the system works throughout a typical day:
Morning through midafternoon (off peak): Your solar panels generate electricity. Your home uses what it needs. The excess charges your battery instead of sending all of it back to the grid at the low off peak credit rate.
5 PM to 9 PM (peak hours): Instead of buying electricity from Xcel at 21+ cents per kWh, your battery discharges stored solar energy to power your home. Your air conditioning, oven, EV charger, and everything else runs on energy your panels produced for free earlier that day.
9 PM onward (off peak): Once peak hours end, any remaining battery capacity continues to power your home. If the battery is depleted, you draw from the grid at the lower off peak rate.
The result is that you avoid buying electricity during the most expensive hours of the day. Every kilowatt hour your battery discharges during peak time saves you the full peak rate. Over a year, that adds up to $600 to $1,200 in additional savings beyond what solar panels alone provide.
Modern battery systems like the Tesla Powerwall 3 and Enphase IQ handle this optimization automatically. The battery software reads Xcel’s TOU rate schedule and adjusts charging and discharging cycles without any manual input from you. You set it and forget it.
Real Numbers: What a Denver Homeowner Can Expect to Save
Let us walk through a realistic example for a Denver household on Xcel TOU rates.
Average monthly electricity usage: 800 kWh
Peak hour consumption (5 to 9 PM): Approximately 250 kWh per month (roughly 30% of total usage, which is typical for a family that is home evenings)
Without solar or battery: At an average blended TOU rate, the monthly bill comes to approximately $115 to $130. The 250 kWh consumed during peak hours costs around $53 at 21.3 cents per kWh.
With solar only (8 kW system): Solar offsets most daytime usage and generates net metering credits. But those credits are earned at off peak rates. Monthly bill drops to approximately $40 to $60, depending on the season.
With solar plus one 13.5 kWh battery: The battery stores midday solar production and discharges it during peak hours. That 250 kWh of peak consumption is now covered by stored solar energy at zero marginal cost. Monthly bill drops to $15 to $30. Many months, the bill is just the fixed Xcel service charge of around $10 to $12.
Over a full year, the solar plus battery household saves an additional $600 to $1,200 compared to solar alone, purely from TOU rate optimization. That does not include the backup power benefit during outages or the Xcel Renewable Battery Connect rebate that offsets the battery upfront cost.
Read more about battery backup for Colorado homes
Xcel’s Battery Rebate Makes the Math Even Better
Xcel Energy’s Renewable Battery Connect program offers up to $5,000 in upfront rebates when you install a qualifying battery and agree to participate in their virtual power plant program. The program pays $350 per kilowatt of battery capacity, plus $100 in annual bill credits for five years.
Here is what that looks like for a Tesla Powerwall 3 installation:
Battery cost before incentives: $12,000 to $14,000 installed
Xcel Renewable Battery Connect rebate: Up to $5,000
Colorado 10% battery storage tax credit: $1,200 to $1,400
Federal Residential Clean Energy Credit: Up to 30% if eligible (consult your tax advisor for 2026 eligibility)
Annual TOU optimization savings: $600 to $1,200
Annual VPP bill credits from Xcel: $100
After stacking incentives and accounting for ongoing TOU savings, many homeowners see a net battery cost in the $5,000 to $7,000 range with a payback period of 5 to 7 years. After payback, the TOU savings and VPP credits are pure profit on your investment.
See the full Colorado solar incentives guide for 2026
Three Strategies to Maximize Savings Under TOU Rates
Whether or not you are ready to install solar and battery storage today, here are three approaches to reduce your peak hour costs right now.
Strategy 1: Shift What You Can to Off Peak Hours
Some loads are easy to move. Run your dishwasher after 9 PM or on weekends. Set your EV to charge overnight starting at midnight. Do laundry on Saturday mornings instead of weekday evenings. Program your thermostat to precool or preheat your home before 5 PM so the system runs less during peak hours. These behavioral shifts alone can save $15 to $30 per month.
Strategy 2: Install Solar to Offset Daytime Usage
Even without a battery, solar panels eliminate most of your daytime electricity consumption and generate net metering credits. Under TOU rates, you will want your system sized to maximize midday production so there is surplus available for battery storage later. A well designed 7 to 9 kW system covers most Colorado homes.
Get a free solar quote from Apollo Energy
Strategy 3: Add Battery Storage for Full TOU Optimization
This is where the biggest savings happen. A battery lets you store your own solar energy and deploy it during the hours when grid electricity is most expensive. It also provides backup power during outages, which are becoming more frequent across the Front Range. If you already have solar, retrofitting a battery is straightforward and Apollo Energy handles the full process.
Explore solar financing options in Colorado
Who Benefits Most from Solar Plus Battery Under TOU Rates?
Not every household will see the same level of savings. The homeowners who benefit most from adding battery storage for TOU optimization typically share a few characteristics.
High evening electricity usage. If your household is active between 5 PM and 9 PM with cooking, air conditioning, EV charging, and multiple people home, you are paying the most during peak hours and stand to save the most.
South or west facing roofs. West facing solar panels produce more electricity in the late afternoon, extending production closer to the 5 PM peak window. South facing roofs maximize total production. Both orientations work well with battery storage.
Electric vehicle owners. EV charging is one of the largest single electrical loads in a home. Shifting that load from peak hours to overnight, or powering it from stored solar, can save $30 to $50 per month on its own.
Homeowners planning to stay in their home for 5+ years. The financial return on solar plus battery compounds over time. The longer you own the system, the greater the total savings, especially as Xcel continues to raise rates.
The Bottom Line on TOU Rates and Solar in Colorado
Xcel’s time of use rates are not going away. In fact, they represent the future of electricity pricing across Colorado. As the grid faces increasing demand from population growth, EV adoption, and data center expansion, utilities will continue to shift costs toward peak hours to manage that demand.
Homeowners who invest in solar and battery storage today are locking in protection against both rising rates and peak hour pricing. You produce your own electricity for free, store it, and use it when it is worth the most. That is not just a good environmental decision. It is one of the smartest financial moves a Colorado homeowner can make in 2026.
Apollo Energy designs every solar and battery system with TOU optimization in mind. Our proposals include projected savings under Xcel’s current rate structure so you can see exactly what the numbers look like for your home. We handle permitting, installation, Xcel interconnection, and enrollment in the Renewable Battery Connect rebate program.
Ready to stop overpaying during peak hours? Get a free solar and battery quote from Apollo Energy.