Upfront passive incentive
A one-time check from CT Green Bank when your battery is approved and enrolled. Capped per kWh of battery capacity, paid through your installer.
CT ESS program
Get paid to own a battery in Connecticut.
Teamsun is a Certified CT ESS Install Program Partner. Connecticut's Energy Storage Solutions program pays a minimum rebate of $5,000 — and depending on location, can cover up to 100% of the battery cost — plus annual performance payments for batteries on Eversource or United Illuminating service.
By the numbers
- Minimum rebate $5,000
- Possible coverage Up to 100%
- Eligible utilities Eversource · UI
- Annual payment Performance-based
How it pays
Two payments, one enrollment.
CT ESS pays you twice — once at enrollment, then annually for as long as your battery participates. Both are stackable with the up-to-40% commercial federal ITC.
Annual performance payment
Eversource and United Illuminating pay you each year based on your battery’s availability during peak grid events. Paid by program-year cycle.
No discharge to your home
Dispatch events use grid-export only — your home is never left without power. Backup capability is fully preserved during outages.
Stacks with commercial ITC
For commercial systems, CT ESS payments do not reduce federal ITC eligibility — up to 40% applies to the full battery cost basis. Residential ITC no longer applies in New England, but CT ESS alone can cover up to 100% of the residential battery cost.
Who qualifies
Four conditions every project meets.
The CT ESS approved-product list is short and stable. Every battery Teamsun installs is on it.
CT residents on Eversource or UI
Both Connecticut investor-owned utility customers qualify. Municipal utility customers (Norwich Public Utilities, Wallingford, etc.) follow separate programs.
New or existing solar systems
You can enroll a brand-new Teamsun solar+battery install, or retrofit a battery onto solar that another company built. Both paths are equally accepted.
Approved Tier 1 batteries
FranklinWH, Tesla Powerwall, and Enphase IQ Battery are all approved CT ESS batteries. Approved-product list is maintained by CT Green Bank and refreshed periodically.
Standalone battery enrollments
You do not need solar to participate. CT homeowners can install a battery for backup and demand-response payments without ever putting a panel on the roof.
How Teamsun handles it
Filing every form for you.
The CT ESS application has multiple parties — CT Green Bank, Eversource or UI, plus the battery manufacturer. Teamsun coordinates all of them as part of the install fee.
CT Green Bank application
We file the upfront-incentive enrollment paperwork with CT Green Bank as part of the install. Your only job is to sign.
Utility dispatch enrollment
Eversource or UI registration for the demand-response side, including the battery telemetry connection that lets the utility see availability.
Approved product confirmation
We confirm your specific battery model is on the current CT ESS approved-product list before install — no surprises about eligibility.
Annual payment follow-up
When your annual performance check arrives, you can call our Bristol office if anything looks off. A person picks up.
Our approach
Our process,
Our process,
refined through
9,000 installs.
01.
Design
A 15-minute call, then a remote or on-site visit. Aurora-based design, panel and battery brand named on the proposal.
02.
Build
Permits filed, utility interconnection submitted, and equipment staged at our Bristol warehouse.
03.
Install
Local crew, local trucks. Most systems installed & completed in one day. Final inspection scheduled before we leave.
04.
Perform
PTO from your utility, ITC and rebate paperwork filed, and 25 years of local service after the system goes live.
What customers say
Trusted by homeowners
Trusted by homeowners
who value quality.
“Teamsun was the only crew that walked the roof, named the panel brand, and answered every question without checking with someone. Same lead tech came back a year later when I added a battery.”
“Three of my neighbors had Teamsun, so I called them. The crew was on my street five days after I signed.”
“They knew the historic district secretary by first name. Saved us six weeks on permitting alone.”
“Same lead tech who installed it came back four years later to swap an inverter under warranty. No charge, no excuses.”
CT ESS FAQ
Questions Connecticut homeowners ask about CT ESS.
How much does CT ESS pay?
The upfront passive incentive starts at a minimum of $5,000 and is calculated per kWh of battery capacity. Depending on your location, it can cover up to 100% of the battery cost. The annual performance payment depends on dispatch events and battery availability. As a Certified CT ESS Install Program Partner, Teamsun shares the current rates on every proposal so you see the math before you sign.
Who runs the program?
CT ESS is jointly administered by the Connecticut Green Bank, PURA (CT Public Utilities Regulatory Authority), Eversource Connecticut, and United Illuminating. Teamsun coordinates with all four on your behalf.
Will my battery still work during a blackout?
Yes. Dispatch events use grid-export only. The battery stays full and ready to back up your home during outages. CT ESS does not allow utilities to drain your battery to your home loads.
Can I add a battery to solar I already have?
Yes — see our battery retrofit service. Existing solar systems on Eversource or UI service qualify for CT ESS as long as the battery is on the approved-product list. We file the same enrollment paperwork as a new install.
Do I need solar to participate?
No. Standalone batteries (no solar) are eligible for CT ESS with the $5,000 minimum rebate. Commercial standalone batteries also stack up to 40% federal ITC; residential ITC no longer applies in New England. Some homeowners install a battery first for backup and demand-response payments, then add solar later.
How long does the dispatch period last?
Most dispatch events run 1 – 3 hours during peak grid demand windows — typically afternoon-into-evening on the hottest summer days. Total dispatch hours per program year are capped, and you are paid based on availability.
How long does enrollment take?
Allow 4 – 8 weeks from contract signing to active enrollment. Site visit and design lock takes 1 – 2 weeks, install runs 1 – 2 days on-site, and CT Green Bank application processing takes 3 – 6 weeks.
What happens if I sell my house?
CT ESS enrollment transfers with the property — the new owner inherits the upfront-incentive credit and the dispatch enrollment. Annual performance payments accrue to whoever owns the home each year.
Can I exit the dispatch program if I want my battery to be private-use only?
Yes. You can opt out of dispatch at any time, but you forfeit the annual performance payment for that program year. The upfront passive incentive is not clawed back.
How does CT ESS interact with the federal ITC?
For commercial systems, they stack. The up-to-40% federal ITC applies to the full installed cost of the battery, before CT ESS reduces your effective net cost. CT ESS payments do not reduce your federal credit basis. Residential ITC no longer applies in New England — but CT ESS alone can cover up to 100% of the residential battery cost depending on location. Speak with your CPA about your specific tax situation.
Project consultation
Have a solar project
Have a solar project
in mind? Let's talk.
Tell Teamsun about your property, energy goals, and questions. We will help you identify the right next step for the project.
Start with the property
Share the address,
utility, and project goal.
Confirm availability
Teamsun will confirm
coverage for your address.
Match the next step
Solar, storage, roofing,
EV charging, or service.