Deployment Case Study · 4 min read
Vermont VPP Case Study: Green Mountain Power's July 2026 Dispatch
By VPPdirectory · Published · Reviewed and updated · Editorial contact: Jared Theaman
Green Mountain Power reports deploying 90 MW of battery power during Vermont's early July 2026 heat. Its July 28 account provides a useful example of coordinating customer and utility batteries to reduce peak demand.
What happened in Vermont
| Measure | GMP's July 28, 2026 account |
|---|---|
| Completed operation | Early July heat event in Vermont |
| Battery power dispatched | 90 MW from residential and utility-scale batteries |
| Estimated peak-cost savings | Approximately $6 million for GMP customers |
| Broader VPP size | 110 MW as of July 2026, including other resource types |
The 90 MW event result and 110 MW portfolio figure describe different things. Neither is a home-battery-only total. The savings estimate is a system benefit, not a payment promised to each participating household.
Section sources
How home batteries enter the deployment
GMP offers both a battery lease and Bring Your Own Device enrollment. The lease pairs home backup with shared utility access during peaks. BYOD lets customers choose supported equipment and an installer, then agree how much stored energy to share. These are distinct ownership and payment arrangements.
| Pathway | Published offer checked October 28, 2026 | Confirm before signing |
|---|---|---|
| Lease | Two batteries over ten years: $55 per month or $5,500 upfront | Final installed cost can vary by site and installer |
| BYOD | $850/kW for a three-hour commitment or $950/kW for four hours | Eligible equipment, committed output, incentive cap and backup allocation |
The BYOD figures are alternative enrollment incentives, not annual income or amounts to add together. GMP also describes a location-dependent retrofit adder. Ask the utility to confirm eligibility and the written agreement for the specific property.
What a buyer can learn from this case
The procurement lesson is to define the service before comparing fleet sizes. A peak-reduction proposal should specify the target meter boundary, event window and measurement method. Ask for the interval trace across the whole window, including recharge, rather than relying on a single headline MW figure.
- Separate home batteries, utility-scale batteries and other resources in the proposed delivery stack.
- Request the savings calculation: avoided cost category, applicable period, baseline and program costs.
- Write down backup reserve, storm preparation, customer overrides and responsibility for failed communications.
- For homeowners, compare the installed cost, lease or ownership terms, warranty and exit conditions alongside the incentive.
Evidence you would still need for a contract
An operator's public account helps establish deployment experience. Contract diligence still requires event-level records, an agreed performance test and evidence that resources can deliver at the location being procured. Keep estimated avoided costs separate from verified cash settlements and participant compensation.
Compare written offers
- Download the offer and bid comparison workbook (Excel)
Compare a home-battery offer or record the evidence behind a utility peak-reduction proposal.
Sources and further reading
Frequently asked questions
Was this a real operating VPP deployment?
Yes. GMP's dated utility account describes a completed July 2026 dispatch from an existing Vermont battery network.
Were the reported savings independently verified by VPPdirectory?
No. We checked the primary utility publication and enrollment pages, but did not audit telemetry, settlement records or the savings model.
How should I compare the lease and BYOD options?
Compare total installed cost, ownership, committed discharge duration, backup reserve and exit terms using the current written offer for your property.
Find the operators serving your market
Compare source-linked VPP aggregators and flexible capacity providers by state, technology, and program status.
Keep reading
How to Procure VPP Capacity: An RFP Guide for Utilities and Large Loads
Define the product and the evidence bidders must supply before comparing headline MW or accepting a historical dispatch as a future guarantee.
Home Battery VPP Programs: How to Compare Offers in 2026
A practical side-by-side checklist for choosing among the offers your exact battery and utility account can actually join.
Idaho VPP Case Study: Wattsmart Battery's 2025 Dispatch Record
A utility annual report documents repeated battery operation in Idaho and shows why capacity potential and delivered power need separate evidence.