As of January 2015, the main customer service number for National Grid in Massachusetts is 1-800-322-3223. For power outages and emergencies, phone 1-800-465-1212. To contact the company by mail, write to National Grid, Customer Service Center, P.O. Box 960, Northborough MA 01532-0960.
National Grid's regular customer service hours as of January 2015 are Monday through Friday, 7 a.m. to 5 p.m. EST. For issues with credit and collections, call 1-888-211-1313. The business hours for credit and collections are Monday through Friday, 7 a.m. to 9 p.m., and Saturday, 7 a.m. to 5 p.m. If doing work near power or high-voltage lines, contact the hazard identification hotline at 1-888-625-3723. To submit a claim for damage to a customer's property, call 1-781-907-3930.