Vermont's Largest Power Source Is a Battery Network
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- Green Mountain Power dispatched 90 MW from its virtual power plant during Vermont's early July heat wave, cutting an estimated $6 million in peak electricity costs passed on to all GMP customers — not just those with enrolled batteries.
- GMP's VPP now totals 110 MW of capacity, making it Vermont's largest single power resource, with 53 MW sourced from over 10,000 residential batteries enrolled by 5,000+ customers.
- The residential battery fleet can supply nearly 10% of Vermont's summer peak demand, which GMP calls the highest storage-to-state-peak ratio in New England.
- GMP's home battery lease program — the first state-approved, tariffed battery lease from a U.S. utility — offers two Tesla Powerwalls for $55 per month or $5,500 upfront for a 10-year term in exchange for grid access during peaks.
- The growing VPP enabled permanent retirement of peaker plants in Vergennes and Rutland via an ISO-New England retirement process, with additional retirements planned as battery capacity expands.
- Last year's VPP dispatch saved GMP customers $11 million, putting the early-July $6 million figure on pace for comparable or larger annual savings.
Why it matters: Vermont customers of Green Mountain Power saved an estimated $6 million in peak costs during an early July heat wave as 90 MW of residential and utility batteries dispatched from a single virtual power plant — now Vermont's largest power resource at 110 MW. With peaker plants already retired in Vergennes and Rutland, the 5,000+ enrolled households are simultaneously earning grid revenue and backing up their own homes.
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![Hurricanes, heat domes, and holding up the grid with home batteries [update]](https://electrek.co/wp-content/uploads/sites/3/2025/06/power_lines.jpg?quality=82&strip=all&w=1600)