Yehuda Gittelson climbs onto a snow-dusted roof in South Portland on a February morning when the thermometer reads 18 degrees.
The homeowner watches from below, skeptical.
She’d called Solaris Energy Solutions three days earlier with concerns about ice accumulation on her panels and whether her system would generate any power until spring.
Gittelson, a NABCEP-certified solar installer, checks the monitoring app on his phone and shows her the production data.
Despite two inches of snow from the previous night, her system had already generated 4.2 kilowatt-hours since sunrise at 6:47 a.m.
The skepticism proves unfounded. Cold temperatures don’t hinder solar panels. They help them perform better.
Cold Makes Panels Work Better
The physics behind winter solar energy efficiency challenges common assumptions about renewable energy in cold climates.
Photovoltaic cells convert sunlight into electricity more effectively at lower temperatures. Most panels reach peak efficiency around 77 degrees Fahrenheit, with output dropping as temperatures climb higher. Maine’s winter conditions keep panels well below that peak temperature, allowing them to operate at optimal capacity even on frigid days.
Temperature differences create measurable performance gains.
Solar panels can improve efficiency by 10 to 13 percent in freezing conditions compared to hot weather.
Panel manufacturers build systems rated for extreme cold, with operational ranges extending to negative 40 degrees Fahrenheit.
The efficiency advantage matters less than expected for annual production calculations, however.
Winter days in Portland average just under 9 hours of daylight, compared to more than 15 hours at the summer solstice. Seasonal production data for Portland clearly show this imbalance. A typical residential system generates an average of 5.79 kilowatt-hours daily during summer months, 5.37 kilowatt-hours in spring, 3.30 kilowatt-hours in autumn, and 1.96 kilowatt-hours in winter. The reduced daylight hours offset the improved panel efficiency.
Angles Matter for Snow and Production
Gittelson designs systems with these seasonal variations in mind.
Panel angle affects both year-round production and snow management. Steeper angles shed snow more effectively but may reduce overall annual output. Most residential installations in Maine use angles between 30 and 45 degrees, balancing snow removal with energy generation year-round.
A 38-degree south-facing tilt maximizes annual production for Portland’s latitude, but adjustable systems can extract more energy during specific seasons. Winter optimization calls for a 58-degree angle to capture the sun’s lower trajectory, while summer production peaks with panels at 27 degrees.
Let It Slide
Snow accumulation creates the most visible barrier to winter production, but its impact proves smaller than homeowners expect. Maine receives substantial snowfall, yet analysis shows panels lose just 3 percent of annual energy generation to snow coverage.
Most snow clears within hours or days without intervention.
Solar panels absorb sunlight, raising surface temperatures that melt snow faster than the surrounding roof materials. The panels’ dark color and smooth glass surface accelerate this process. Angled installations allow gravity to pull loosened snow downward. Sunlight can penetrate a few inches of snow cover, warming panels enough to initiate melting from below.
Gittelson installed a system for a homeowner in Cape Elizabeth who documented production during a heavy December storm.
Eight inches of snow blanketed the roof overnight.
The panels generated minimal power the following morning, but by noon, sunlight had warmed most arrays. Production resumed at 60 percent of typical winter output within six hours of sunrise.
Manual snow removal carries risks that outweigh potential benefits.
Climbing onto icy roofs endangers installers and homeowners. Raking or shoveling can scratch panel surfaces or damage electrical connections.
Industry professionals recommend patience over intervention. Snow removal yields marginal production gains that rarely justify the safety concerns or the risk of equipment damage.
Gittelson advises customers to wait. The sun melts snow faster and more safely than manual clearing.
Banking Summer Sunshine
Maine’s net metering policies transform the seasonal production imbalance into an economic advantage. Homeowners generate 70 to 80 percent of their annual solar electricity between March and October.
Excess summer production creates credits with utility companies that offset winter consumption when days are short and heating loads are high.
A residential system in Portland typically produces surplus energy from April through September. Those credits accumulate on utility bills and carry forward month to month. Winter draws down the credit balance, but properly sized systems generate enough annual production to cover year-round consumption.
July and August represent peak production months in Maine, followed closely by April, May, and September.
November typically delivers the lowest output due to short days, frequent cloud cover, and rain.
Snow impacts December, January, and February production less than cloud cover and daylight duration.
Customer education about seasonal patterns prevents disappointment and ensures realistic expectations.
Gittelson reviews production curves during site assessments, showing homeowners how their system will perform across twelve months. He emphasizes that solar provides a yearly economic return rather than consistent daily generation.
Snow States Lead the Way
Northern states with harsh winters rank among national leaders for winter solar energy installations.
The Winter Solar Energy Industries Association’s 2024 data shows Illinois fourth, Ohio fifth, New York seventh, Indiana tenth, Wisconsin 16th, and Maine 18th nationally for solar PV installations.
Maine’s solar market continues expanding.
The state has installed approximately 486 megawatts of capacity, and rooftop solar potential reaches 6,300 megawatts, enough to provide 60 percent of Maine’s electricity consumption.
Average system costs have declined sharply over the past decade while efficiency has improved.
Installation timing affects how quickly homeowners capture financial returns.
Spring installations allow systems to come online before peak production months, building net metering credits ahead of summer electricity demand spikes.
Waiting until after receiving high summer bills means missing those months of maximum generation.
Battery storage adds resilience for homeowners concerned about winter power outages.
Grid-tied systems without batteries shut down during outages regardless of sunshine.
Battery backup keeps essential appliances running when the grid fails, functioning similarly to a generator.
Gittelson completed his NABCEP PV Installation Professional certification in 2023 after accumulating 58 hours of advanced training and demonstrating competence across installation, design, commissioning, and maintenance.
The certification requires passing a rigorous examination and maintaining credentials through continuing education every three years.
His work involves more than technical installation.
He addresses misconceptions that discourage adoption and explains how systems actually perform in Maine’s climate.
A customer in Falmouth called Gittelson last November expressing frustration.
Her panels had been covered with snow for three days following an early season storm. She assumed the system would remain dormant until spring.
Gittelson checked her monitoring data and explained that despite the coverage, her annual production would meet projections. The snow had already begun sliding off the south-facing arrays, and the winter deficit would be offset by summer surplus through net metering credits.
Panel warranties typically extend for 25 years or longer, a testament to the manufacturer’s confidence in equipment durability.
Systems require minimal maintenance.
Rain cleans panels during warmer months, and snow slides off in winter. Monitoring apps alert homeowners to performance issues, but day-to-day attention proves unnecessary.
Maine’s electricity rates average 23.9 cents per kilowatt-hour, ranking eighth highest nationally. Rates climbed 42 percent between 2020 and 2024.
Solar installations lock in energy costs for decades, insulating homeowners from continued utility rate increases.
Gittelson measures success by system performance rather than customer perception of seasonal output.
He reviews annual production data showing how winter deficits disappear when calculated across twelve months.
The technical realities contradict popular assumptions.
Winter solar energy doesn’t require constant sunshine or warm temperatures. It requires light, which Maine receives even on cold, clear winter days.
Climate isn’t the barrier.
Policy support, installation costs, and public awareness drive adoption more than weather.
Gittelson encounters resistance from homeowners who equate winter solar energy with southwestern desert conditions.
He points to data from northern states and explains that Portland generates meaningful electricity year-round.
Systems pay for themselves within six to eight years and generate $20,000 to $40,000 in savings over 25-year lifespans.
Winter production matters less than annual production.
Customers don’t heat their homes only in summer or run appliances exclusively when days are long. They consume electricity continuously.
Net metering allows systems to supply that consumption across all seasons.
The South Portland homeowner who worried about February performance now checks her monitoring app regularly.
Her system has cleared itself of snow repeatedly throughout the winter. Her utility bills show credit accumulation that will carry into spring.
She mentions the panels to neighbors who express the same skepticism she held three months earlier.
Gittelson will return to her roof in June to inspect the installation and review annual performance data.
He expects the numbers to confirm what physics predicts.
Her system will have generated enough electricity to offset most of her consumption despite Maine’s long winters and short December days. The cold temperatures that concerned her in February will have improved efficiency when it mattered most.
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