Up on the housetop click, click, click: no it’s not good St. Nick.

A coalition of environmentalists, health professionals and local legislators are hoping that by 2030, what’s on the rooftop, on at least a million Massachusetts rooftops, is an array of solar panels providing enough electricity to power the household and maybe an electric car or two.

“It’s pollution free, clean, local and abundant, nearly limitless,” said Ben Hellerstein, state director of Environment Massachusetts Research Policy Center. “Rooftop solar could generate 47% of the electricity currently used in Massachusetts each year.”

And not just on rooftops. Hellerstein advocated the installation of solar panel fields on landfills, in parking lots, on top of warehouse buildings, big box stores and corporate lawns. Some states even install solar arrays on highway medians and along roadsides.

Installing solar on one million rooftops could generate 10 gigawatts of power, Hellerstein said. Currently, solar arrays generate about 4,000 megawatts of power in Massachusetts; Hellerstein wants to see enough arrays to generate another 6,000 megawatts to reach the 10-gigawatt goal. One roof generates about 10 kilowatts of power.

The coalition, gathered in front of the State House Thursday, urged the state legislature and those politicians who will be leading Massachusetts in the new year, to create incentives to the development of solar energy.

Further, they urged that any roadblocks, whether financial or institutional, be eliminated to increase access to and use of solar panels by private residents, businesses and government entities.

The group delivered a letter, signed by 150 community leaders, politicians, medical and health experts, and environmentalists to “state leaders.”

Massachusetts, once a leader in the field of solar energy development, has recently lagged, Hellerstein said. He urged the state to ensure that incentives to install solar panels for businesses and homeowners continue and be expanded.

In advocating for solar energy, Hellerstein noted that it’s not just a matter of reducing the state’s dependence on fossil fuels and its carbon footprint. Solar power, Hellerstein said, is the key to Massachusetts clean energy future.

Environmental justice, as well as health issues caused by fossil fuels, are also a concern.

Lisa Quinn, a nurse practitioner and an assistant professor at the mgh Institute of Health Professions, said one million solar rooftops would ensure cleaner air, lower heath care costs and fewer sick days for Massachusetts residents.

“It’s not just about the carbon emissions,” Quinn said. Burning fossil fuels fills the air with nitrous oxide, silver dioxide, and particulates — all elements that attack respiratory systems, compromise lung and heart health and even contribute to cancers.

“There are two ways fossil fuels impact health,” Quinn said, citing direct exposure to fuel oil, a common heating element in Massachusetts and exposure to particulates through burning. Direct contact with, or inhaling fumes from the heating oil, can cause short term issues like headaches and rashes. Long term contact can damage the heart, liver, kidneys and cause clotting issues with blood.

Sara Nelson, with the non-profit Community Action Works, noted that thousands of people die every year due to health complications from pollution, heat and weather.

“This was the hottest summer on record,” Nelson said, noting that storms, floods and droughts will be a factor in the future. She predicted that this past summer will be the coolest going forward.

“Community resilience depends on green technology, on solar technology,” Nelson said. The non-profit works with residents and communities around Massachusetts to support actions they take against polluters. Climate justice and social justice are intertwined.

Cambridge City Councilor Patty Nolan said as progressive as Cambridge is, it has fallen behind  its goals to reduce its carbon footprint.

“We need the state to help us meet those goals,” Nolan said. “The state needs to set targets, meet goals. There’s no excuse for stalling, it’s not too difficult, we can’t wait for this to be implemented.”

Speakers also discussed the economic impact of creating financial incentives for residents to install solar panels. Low income residents spend a greater proportion of their income, three times more of their paychecks, on heating costs, costs which could be lowered through the installation of solar panels.

Massachusetts must remove systemic barriers to access solar technology, said Elena Weissmann, of Vote Solar, a nonprofit advocacy organization that works with the legislature and on a regional level to advance clean energy policies.