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Maine Renewable Portfolio Standard

Date Last Updated11/19/2012
Policy TypePortfolio Standard
Policy Administrator/Contact OfficeMaine Public Utilities Commission
Policy Initiation Date9/1/1999
Policy SummaryMaine's Renewable Portfolio Standard (RPS) has two separate classes of eligible resources: Class I and Class II. Class II resources include electricity generated by efficient existing CHP facilities and other systems that qualify under the federal Public Utility Regulatory Policies Act of 1978 (PURPA). Class I resources include new renewables that have come online after September 1, 2005.

The RPS requires each electricity provider to supply at least 40% of their total electric sales using eligible resources by 2017. Providers must supply at least 10% of total sales using eligible new Class I renewables and 30% of eligible existing Class II resources.

The Maine PUC uses New England Power Pool Generation Information System (GIS) certificates to satisfy the portfolio requirements. The GIS certificates are similar to renewable-energy credits (RECs). GIS certificates are awarded based on the number of kWh of eligible electricity generated. There is a 1.5 credit multiplier available for qualifying community-based renewable energy projects. The PUC also set an alternative compliance payment (ACP) that utilities may choose to pay instead of procuring GIS certificates to satisfy the RPS.
CHP Eligibility RequirementsBoth fossil-fueled and renewably-fueled CHP systems are eligible under the RPS.
Eligible Project Size (MW)CHP systems <100 MW (termed "small power production facilities") are eligible under Class II in the RPS.
Minimum Efficiency Required/
Other Performance Requirements
CHP systems must have a 60% efficiency rate and must have begun operation prior to January 1, 1997, unless they are renewably fueled systems and then a start date of after September 1, 2005 applies.
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