A Utility Building the Grid of the Future One Battery at a Time
Green Mountain Power (GMP), Vermont's dominant electric utility, is expanding what has become one of the most innovative virtual power plant programs in the United States, adding a new battery lease offering that allows residential customers to install home backup batteries with minimal upfront investment. The program leverages Enphase storage systems and enables GMP to aggregate thousands of home batteries into a dispatchable grid resource while giving customers energy resilience and reduced electricity costs.
The virtual power plant model works by treating distributed home batteries not as isolated backup devices but as networked grid assets. When the grid needs additional capacity — during peak demand periods or when renewable generation falls short — GMP can dispatch power from enrolled home batteries, reducing the need to activate expensive peaker plants or import power from neighboring grids. In exchange, customers receive bill credits and program incentives that partially or fully offset their system costs.
How the New Lease Program Works
The battery lease program represents an evolution of GMP's approach to removing the primary barrier to home energy storage adoption: the high upfront cost of battery systems, which typically ranges from $10,000 to $15,000 before installation costs for whole-home backup solutions. Under the lease structure, GMP or a financing partner retains ownership of the battery hardware while the homeowner benefits from backup power and bill credits for grid services.
Customers pay a monthly fee — structured to be offset or exceeded by bill credits from grid participation — rather than a capital purchase price. This transforms the battery from a capital expenditure requiring years of payback calculation into an operational expense with immediate net benefit. For customers in Vermont who experience regular grid outages due to winter storms and aging distribution infrastructure, the backup power value alone can justify participation.
Green Mountain Power's Track Record
GMP's virtual power plant program has a longer operational history than most comparable programs in the country. The utility began enrolling customers in home battery programs in 2015, building operational expertise in managing distributed battery dispatch, customer enrollment at scale, and the regulatory frameworks required to count distributed resources toward capacity obligations. That experience has made GMP a frequent reference point for utilities in other states considering similar programs.
The program currently includes thousands of enrolled home battery systems plus a fleet of leased Tesla Powerwall units that GMP has placed in customer homes for grid stabilization purposes. The Enphase systems being added through the new lease program complement this fleet, broadening GMP's flexibility in matching storage technology to customer and grid needs.
Policy and Market Context
Vermont's regulatory environment has been exceptionally supportive of utility investment in distributed energy resources. The state's electric grid operator has developed frameworks for counting aggregated distributed batteries toward resource adequacy requirements, creating the economic basis for GMP's program investments.
At the national level, the Inflation Reduction Act's investment tax credits for home battery storage have improved the economics of these programs substantially, allowing utilities and customers to share in federal incentives that reduce effective system costs by up to 30 percent. GMP's program offers a proven template that other utilities are actively studying as they pursue their own distributed energy resource programs.
This article is based on reporting by Electrek. Read the original article.
