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Home > Electricity >Renewable Portfolio Standard

Maine Renewable Portfolio Standard (RPS)


Maine Statute (M.R.S. 35-A §3210) requires 30% of Maine load be satisfied by existing renewable electricity generation (Class II) and 10% of Maine load in 2017 and beyond be satisfied by new renewable resources (Class I), and increasing amounts of Class IA and thermal renewable energy credits (TRECs) starting 2020 and 2021, respectively. By 2030, 40% of Maine load must be satisfied by Class IA resources and 4% by TRECs. Chapter 311 of the Commission rules implements the RPS.



RPS Resource Certification


Class II resources self-certify as participants in the NEPOOL GIS REC tracking system. 

Class I, IA, and TREC resources require certification by the Maine PUC.



A Class I Renewable Energy Resource is a new renewable capacity resource such as wind, solar, biomass, hydropower or geothermal. Class I facilities must register with the Maine Public Utilities Commission. Registered facilities are listed here:

RPS Class I, IA, and TREC Renewable Resources Applications Attachments
List of Applicants for Class I, Class IA, and TREC Certification PDF File Excel File


Annual RPS Reports


35-A M.R.S. §3210(3-A) requires the Commission to provide an annual report to the Legislature on Maine’s RPS.