Green Mountain Power's Virtual Power Plant Saves Millions in Vermont

Green Mountain Power (GMP) in Vermont has made its virtual power plant (VPP) the state's largest single energy resource, boasting 110 MW of capacity. During an early‑July heat wave the VPP dispatched 90 MW, an amount the utility equates to removing 50,000 homes from the grid, and delivered an estimated $6 million in peak‑electricity savings for all customers. More than half of the plant’s capacity comes from residential batteries, with over 5,000 customers enrolling more than 10,000 batteries, allowing the VPP to supply nearly 10 % of Vermont’s summer peak demand.

A consumer guide notes that VPP participation can entail risks such as lower-than‑expected earnings, exit fees, extra battery cycling that may affect warranties, and potential incompatibilities between home systems and VPP programs. Homeowners are advised to verify battery eligibility, understand charging and discharge controls, scrutinize full electricity plans, and review exit terms before enrolling. The guide cites resources like Solar Choice’s VPP overview and highlights that while VPPs can provide extra credits and backup power, careful review of contract details is essential.