Customer Service

We’re here if you have any questions about your existing account with Green Mountain:


Tel: 844-245-9583

Hours: Mon Fri 8 a.m. 8 p.m. ET

Moving? Call us to transfer electricity service to your new address!

Lights Out? Billing Questions?

To report an outage or to talk to someone about your billing, please call your local utility directly:

  • Eversource (NSTAR): 1-877-659-6326
  • National Grid: 1-800-465-1212
  • National Grid Nantucket: 1-800-322-3223

New Residential Customers

If you’re ready to help us change the way power is made, and you’ve never had an account with us before – join our community now!

Call: 844-853-7531
Hours: Mon Fri 8 a.m. 8 p.m. ET