Customer Service

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

E-mail: MACustomerCare@greenmountain.com

Tel: 844-245-9583

Hours: Mon-Fri 8am-8pm ET

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

Contact Customer Service

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: 1-800-642-3780
  • 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 8am-8pm ET

SIGN UP ONLINE!