Maine Renewable Portfolio Standard

Maine Renewable Portfolio Standard
Name	Maine Renewable Portfolio Standard
Jurisdiction	Maine
Enacted	1997
Latest amendment	2019
Administered by	Maine Public Utilities Commission
Targets	Renewable and Class I/II requirements

Maine Renewable Portfolio Standard The Maine Renewable Portfolio Standard is a state-level renewable energy mandate enacted to increase the share of electricity generated from qualified renewable resources in Maine. It directs retail electricity providers to procure specified percentages of electricity from designated resource classes, creates a market for Renewable Energy Certificates, and is administered by the Maine Public Utilities Commission in coordination with state agencies and regional entities. The policy interacts with regional wholesale markets, federal statutes, and state climate goals.

Overview

The RPS establishes binding procurement obligations for retail providers in Maine and specifies compliance through Renewable Energy Certificates (RECs), alternative compliance payments, and reporting to the Maine Public Utilities Commission. It sits alongside related instruments such as Regional Greenhouse Gas Initiative, New England Power Pool, ISO New England, and state-level statutes that address renewable energy and greenhouse gas mitigation. Market operations involve counterparties including Central Maine Power, Versant Power, Versant Power (Electric) stakeholders, and independent power producers with facilities like wind farms in Maine and biomass power stations. The standard affects project developers, utilities, and consumers, connecting to programs like net metering in Maine and incentives administered by Maine Governor's Office initiatives.

History and Legislative Development

Maine's RPS originated in statutes enacted in the late 1990s and was modified through legislative acts and commission orders influenced by national and regional developments such as Energy Policy Act of 1992, Public Utility Regulatory Policies Act of 1978, and the expansion of renewable energy in the United States. Major legislative milestones include amendments by the Maine Legislature that adjusted targets and resource definitions, and executive influence from successive Governor of Maine administrations. Regulatory refinements occurred via docketed proceedings before the Maine Public Utilities Commission, with stakeholder participation from entities like Maine Audubon Society, Natural Resources Council of Maine, Conservation Law Foundation, and industry groups such as Maine Renewable Energy Association.

Policy Structure and Targets

The statute defines Class I and Class II resource tiers and sets percentage procurement targets that escalate over time; later amendments established long-term goals aligning with statewide emissions and energy objectives similar to frameworks in California Renewable Portfolio Standard, New York Renewable Portfolio Standard, and Vermont Renewable Energy Standard. Obligations are assessed annually, with alternative compliance payments set by the Maine Public Utilities Commission when suppliers fail to deliver required RECs. The RPS coordinates with programs like Maine Clean Energy and Sustainability Accelerator and regional market structures including New England Power Pool Generation Information System for REC tracking.

Eligible Resources and Definitions

The RPS enumerates eligible technologies and fuels, including onshore and offshore wind power, solar photovoltaic installations, certain hydroelectric facilities, landfill gas, anaerobic digestion, and specified biomass resources. Definitions distinguish between qualified technologies and excluded resources, reflecting debates around biomass eligibility involving stakeholders such as Timberland owners in Maine, wood pellet industry, and conservation organizations like Sierra Club. Eligibility criteria reference facility size, in-service dates, and environmental performance, aligning with technical standards used by entities such as North American Electric Reliability Corporation for interconnection and grid reliability.

Compliance, Enforcement, and Market Mechanisms

Compliance is demonstrated through procurement and retirement of RECs tracked by regional systems such as the NEPOOL GIS; enforcement actions and penalty structures are administered by the Maine Public Utilities Commission. Market mechanisms include REC trading among utilities, independent power producers, aggregators, and brokers, with price signals influenced by factors like federal tax policy (including the Investment Tax Credit and Production Tax Credit), commodity markets, and capacity auction outcomes in ISO New England. The RPS allows alternative compliance payments and banking of RECs across compliance years, and interfaces with interconnection rules governed in filings with the Federal Energy Regulatory Commission.

Impacts and Outcomes

The RPS contributed to deployment of renewable generation in Maine, notably growth in onshore wind projects, distributed solar arrays, and biomass facilities, and supported investment by companies and developers such as Pattern Energy and regional utilities. Outcomes include REC market activity, shifts in generation mix, and ancillary effects on employment in Maine, local tax bases, and transmission planning driven by interconnection of renewable projects to the regional grid. The policy also influenced state greenhouse gas trajectories in coordination with initiatives like the Maine Climate Council and regional climate efforts under Regional Greenhouse Gas Initiative.

Criticisms and Legal Challenges

Critiques have arisen over the treatment of biomass, the environmental attributes of certain hydro resources, REC market volatility, and impacts on retail electricity rates. Litigation and legislative disputes involved stakeholders including industry groups, conservation organizations, and municipal actors, sometimes bringing matters before the Maine Supreme Judicial Court or prompting legislative revisions in the Maine Legislature. Controversies intersect with federal oversight by the Federal Energy Regulatory Commission when markets and interstate wholesale transactions are implicated.

Category:Energy policy in Maine Category:Renewable portfolio standards in the United States