Why It Matters
Maine renters could soon have a new option for reducing their electricity bills after the state legislature passed a bill authorizing small, plug-in solar units. The legislation addresses a longstanding gap in renewable energy access, as renters and low-income residents have historically been unable to participate in solar programs due to high upfront installation costs and the requirement to own a home.
The bill, if signed into law, would expand solar energy access in Maine without adding costs to the state budget or to other ratepayers, according to legislative supporters.
What Happened
Both the Maine Senate and the Maine House of Representatives cast final votes this week in support of LD 1730, a bill that would allow residents to install small, plug-in solar units on balconies, in windows, or in other accessible locations. The bill now heads to the desk of Gov. Janet Mills for her signature.
Unlike traditional rooftop solar systems, plug-in solar units require no permanent installation, no landlord approval for structural modifications, and no large capital investment. The units connect directly to a standard electrical outlet and offset a portion of a household’s electricity consumption.
Rep. Christopher Kessler (D-South Portland) argued during House debate last month that current electricity prices make the units a financially sound choice for consumers. “What this bill is going to do is further allow people to purchase their own plug-in solar generators and produce electrons themselves to reduce their cost of energy,” Kessler said. “This bill is helping to set the safety framework and send the signal to the industry that we are ready to purchase these pieces of equipment.”
Beth Woolfolk, manager of renewable energy planning and policy at A Climate to Thrive, said the bill broadens who can participate in Maine’s clean energy transition. “Plug-in solar opens the door for every Mainer, regardless of their income or housing type, to participate in our clean energy future,” Woolfolk said.
Rep. Reagan Paul (R-Winterport) raised concerns during the debate about the potential for the bill to erode existing regulations, though the bill ultimately advanced with bipartisan support in both chambers.
By the Numbers
Key figures surrounding LD 1730:
• Plug-in solar units are estimated to pay for themselves within a few years based on current Maine electricity prices, according to Rep. Kessler’s floor remarks.
• Approximately 35 percent of Maine households are renters, a population that has largely been excluded from traditional solar incentive programs.
• The bill carries no direct fiscal cost to the state, according to legislative supporters, as it establishes a regulatory framework rather than a subsidy program.
• Maine’s average residential electricity rate has climbed in recent years, consistently ranking among the higher-cost states in the Northeast, increasing financial pressure on renters and fixed-income households.
• Plug-in solar panels typically generate between 300 and 600 watts of power per unit under optimal conditions, enough to offset a meaningful share of a single household’s consumption.
Zoom Out
Maine’s plug-in solar bill follows similar legislative efforts in other states. California, New York, and Colorado have moved to clarify or establish legal frameworks for so-called “balcony solar” or “plug-load solar” systems, responding to growing consumer interest and falling equipment prices. The concept is more established in Europe, particularly in Germany, where plug-in solar units are widely used in apartment buildings.
At the federal level, there has been ongoing discussion about expanding residential clean energy tax credits to cover smaller-scale systems, though no final action has been taken on plug-in units specifically.
Maine has pursued several parallel clean energy initiatives in recent years. The state is also examining longer-term power generation options, including a regional commitment to evaluate advanced nuclear energy signed by Gov. Mills alongside other New England governors.
What’s Next
The bill now awaits action from Gov. Janet Mills. If signed, state regulators and utilities would be responsible for implementing the safety and interconnection standards outlined in the legislation. Supporters expect the regulatory framework to encourage Maine retailers and suppliers to stock plug-in solar equipment more broadly, increasing availability for consumers across the state.
No timeline has been announced for the governor’s decision, though the legislature passed the measure before its scheduled recess window.