Massachusetts Supreme Judicial Court March 7, 2002 (Boston Gas Co. v. Department of Telecommunications & Energy)

Cowin, J.

This case arises out of an order by the Department of Telecommunications and Energy (department) regulating the manner in which Boston Gas Company, doing business as Key-span Energy Delivery New England (company), switches from a “cost of service/rate of return” (COS/ROR) ratemaking model to a “performance based regulation” (PBR) model.