Energy Storage Solutions (ESS)

How It Works

Enrolled battery systems provide backup power during outages and support the electric grid during peak demand events. During seasonal dispatch events, batteries discharge energy to reduce grid strain, offering a cleaner alternative to fossil-fuel generators. Participation is voluntary, and systems must remain internet-connected for monitoring and performance tracking.

Participating Utilities

Eversource, United Illuminating (UI)

Eligibility

Residential and commercial customers within Eversource or UI service territories. Eligible EG4 equipment only.

Hybrid Inverters: FlexBOSS21, FlexBOSS18
Batteries: EG4 WallMount 280Ah (All Weather or Indoor)System must maintain consistent internet connectivity

Incentives

Upfront Incentives: Available through approved Energy Storage Solutions Contractors at the time of enrollment

Recurring Performance Incentives: Paid up to twice per year for 10 years, based on system size and performance

Years 1–5

Summer: $200 / kW
Winter: $25 / kW
Summer: $115 / kW
Winter: $15 / kW

Enrollment

Contractors must first become an Eligible Contractor or TPO through the Connecticut Green Bank
Customer applications submitted via the Energy Storage Solutions Customer Enrollment Platform

Program Oversight

Administered by the Connecticut Green Bank in coordination with PURA, Eversource, and UI. Funded by electric ratepayers.