Hourly Pricing charges the wholesale price of electricity, which changes every hour. It’s usually cheapest overnight and most expensive from 5 to 8 pm, and a few hours a year can cost far more.
The Certasun Blog
ComEd Delivery Time-of-Day Pricing
Delivery Time-of-Day Pricing changes only the delivery part of your ComEd bill: more expensive from 1 to 7 pm and cheaper the rest of the day. You keep the supply plan you have now.
ComEd Time-of-Day Pricing
Time-of-Day Pricing, new in June 2026, sets four prices for each day a year in advance. Electricity costs about three times as much from 1 to 7 pm as it does overnight, with no surprise spikes.
ComEd Rate Plans Explained
ComEd now offers a fixed rate, Hourly Pricing, Time-of-Day Pricing, and Delivery Time-of-Day Pricing. Here’s how each one works, what a kWh costs on each at different times of day, and which fits your home.
The ComEd Battery Rebate: What It’s Worth and Who Qualifies
If ComEd is your utility, you may qualify for a one-time rebate of $300 per kWh of battery capacity, about $4,000 for a Tesla Powerwall 3. Here’s who qualifies, what it’s worth, and when it’s paid.
Downloading Your ComEd Green Button Data
Downloading a year of your ComEd usage takes a few minutes. Here’s how, step by step, so we can design a battery around how your home actually uses electricity.
Illinois Shines Solar Incentive Increases Substantially for the New Program Year
The Illinois Shines solar incentive is now worth 50% or more of the cost of solar.
State Report Ranks Certasun Among Best-Performing Solar Vendors in Illinois
Certasun had — by far — the lowest complaint rate of major Illinois Shines Approved Vendors in 2025.
Certasun Named EnergySage Local Installer of the Year
Certasun was recognized for our commitment to exceptional customer support and quality installations.
Introducing Prio™ for Batteries
We’re expanding Prio™ to include an option for homeowners who want to affordably add a battery to an existing solar system.
ComEd Announces $1,000-$2,500 EV Charger Rebate for 2026
ComEd’s new EV charger rebate grants $1,000 to reduce the cost of installing a level 2 EV charger.
The Future of Solar is Bright
Residential solar in Chicago will be as strong as ever in 2026.
Introducing Prio™
Certasun is proud to introduce Prio™, a new, prepaid rooftop solar service that helps Chicagoland homeowners lock in long-term energy savings even as federal solar incentives evolve.
What to Know About Leasing Solar Panels in Chicago
Leasing solar can be a really fantastic option for going solar — but make sure you understand what you’re signing up for.
Congress on Track to Repeal Residential Solar Tax Credit
Republicans are moving a bill through Congress that would repeal the residential solar tax credit around the end of 2025.
Illinois’ Top Solar Companies
According to data from Illinois Shines, Certasun has installed more residential solar than any other company headquartered in the state.
Take Back Control in Uncertain Times: Why Going Solar is a Smart Choice
Going solar isn’t just about saving money—it’s about creating stability, security, and independence in a time when those things feel harder to find.
Time is Running Out to Secure 2024-25 Illinois Solar Incentive
The Illinois incentive rate is likely to be depleted by January 2025. Read more about how the Illinois solar incentive works.
Depreciation of Home Solar Systems
Despite what unscrupulous solar companies may have told you, depreciation of home solar systems is not allowed.
Four Types of Home Energy Audit in Chicago
There are four different kinds of home energy assessment (or audit). The terminology can be confusing, and people often use the same words for different things.
What SunPower’s Bankruptcy Means for Certasun Customers
Earlier today, SunPower declared bankruptcy. Certasun has switched to Enphase, Maxeon, REC, and Tesla products.
ComEd Solar Rebate Pays Customers Thousands to Go Solar
The ComEd solar rebate pays customers around $3,000 to purchase a solar system.
Using Powerwall on ComEd Hourly Pricing to Minimize your Utility Bill
A Tesla Powerwall can lower your bill on ComEd Hourly Pricing by storing your solar energy and using it when electricity costs more. Here’s how it works and how to set it up.
Reconciling mySunPower with your Utility Bill
You can understand how the production numbers ub mySunPower line up with your utility bill data using a simple formula.
Solar Panels and Snow: What You Need to Know
Solar systems generate more energy in the summer months, but they can be still be productive in the winter, even if it snows. In fact, the impact of snow on solar panels is less than you might think.