A home battery
that automatically powers your home
when the lights go out
, and saves you money
, all while supporting the ComEd grid
.
Base designs, builds, installs, and maintains each Base Core Battery.
Now available in Illinois.
Better power starts with Core:
-
One of the largest home batteries
39.2 kWh in every Base Core, making it one of the largest home batteries available.
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Backup that lasts
Up to 36 hours of whole-home backup with reduced energy consumption. Extend duration with the built-in generator recharge port whenever you need to.
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From hot summer days to cold winter nights
Tested for -22 to 122°F, flash flooding, and submersion-rated to 3 feet.
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Affordable pricing
Automatic, whole-home backup without the five-figure cost of a generator.
Stronger homes, stronger grid
When the grid's up, Base lowers costs by sending power back. When it's down, your battery keeps the lights on.
When the grid is up and running
Base earns from the grid, not you. During demand spikes, your battery sends power out — lowering rates and keeping energy balanced.
So, what happens next?So, what happens next?
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See if Base is available at your home.
When you're ready, enter your address to check your home's eligibility and next steps.
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We'll review your setup.
Our engineers will confirm your home qualifies and handle the paperwork with ComEd, including switching your supply over to Base.
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Installation. We've got it covered.
Your install happens in two visits. After that, your home is backed up, connected, and ready for whatever comes next.
Base Core specs
Power
- Energy Capacity
- Reduced usage duration
- Up to 36 hours
- AC Voltage (nominal)
- 120/240 V
- Grid frequency
- 60 Hz
Features
- Size
- 35.9" H x 30.68" W x 22"
- Operating temperature
- -22 to 122 °F
- Noise
- 55 dBA (at 1 meter)
- Auto-switch
- Seamless (50 milliseconds)
Other details
- Lifetime
- 12 years
- Core maintenance
- Base handles all service and maintenance for the lifetime of the battery.
- Certifications
- UL 1973, UL 9540, UL 991, UL 1998, UL 1741, IEEE 1547-2003
We’ve got answers
What is Base? What is Base Core?
Base is an energy company building a grid for the future so Americans can enjoy affordable, reliable power. We design, build, install, and operate home batteries that back up your home, save your money, and support the grid.
Base Core is our next generation home battery, designed from the ground up to support the grid and now in production at Base Factory 1 in Austin. It backs up your whole home, switches over seamlessly when the grid drops, and can withstand conditions from Texas summers and Chicago winters.
What does Base supply and how does it differ from ComEd?
Base Retail LLC (an affiliate of Base Power) supplies your electricity as an Alternative Retail Electric Supplier (ARES), with ComEd maintaining distribution and emergency management responsibility. Your energy rate is indexed to be at least 15% below ComEd’s price to compare. ComEd publishes their price to compare periodically, and Base’s rate adjusts accordingly.
Your energy supply charges appear on your monthly ComEd bill — not as a separate Base invoice. You pay ComEd directly for your energy.
How am I billed for energy supply?
Your energy bill comes from ComEd — not directly from Base. ComEd consolidates all charges into a single monthly statement. Here’s what you’ll see:
Base Energy Supply Charge: Base Retail LLC’s charge for supplying your electricity. Calculated as your monthly usage (kWh) × Base’s rate, which is indexed to be at least 15% below ComEd’s price to compare.
Battery Dispatch Credit (if applicable): When Base uses your battery to support the ComEd grid during peak demand, you receive a credit. This appears as a line item on your ComEd bill.
ComEd Delivery Charges: Fees for maintaining the infrastructure that delivers electricity to your home (power lines, poles, transformers, meters). These are set by ComEd and the ICC — Base has no control over these charges and receives no portion of them.
Taxes & Other Fees: State and municipal taxes, the Illinois Renewable Portfolio Standard charge, and other regulatory assessments.
How long will it back me up?
Base Core holds 39.2 kWh of energy, which is ~3x the size of typical batteries. How long it lasts depends on how much power you use. A battery stores a fixed amount of energy, so running high-usage devices like A/C drains it faster, just like a bigger hose empties a bucket more quickly.
At reduced usage, a Base Core can back you up for up to 36 hours.
In the case of an extended outage, Core has a built-in generator port that lets you recharge it from a standard portable generator, so you stay powered as long as you have fuel. The Base app shows a real-time estimate of your remaining backup time, at both your current usage and reduced usage.
What testing certifications does it have?
Core is certified under UL 1973, UL 9540, UL 991, UL 1998, UL 1741, IEEE 1547-2003. UL certification is the gold standard for electrical system safety in home appliances, including rigorous fire safety standards.
Core uses lithium iron phosphate (LFP) chemistry, one of the safest battery types available. It’s more stable under high temperatures and far less likely to overheat than standard EV battery chemistries.
Beyond certifications, Core went through extensive test programs: IP67 submersion testing (rated to 3 feet), IPX9K high-pressure water testing, and internal flash-flood testing. It operates from -22 to 122 °F, built for the hottest Texas summers and the coldest Chicago winters. Every installation is performed by certified, bonded, insured, and licensed electricians.