On a 17 acre Maine lot once buried under circuit board waste for three decades, a 7 megawatt solar array now powers nearly 960 subscribers
Copper wire does not disappear just because a factory closes its doors.
For three decades, a 17 acre lot on New Dam Road in Sanford, Maine sat under heaps of shredded circuit board, old tires and rusted drums.
Today the same ground carries rows of tilted panels, converting sunlight into electricity for a Maine utility’s customers.
In the acquisition, the city became liable for all environmental contaminants, mainly soil copper contamination from the copper coated wires in the circuit boards.
It started with a company called CGA Inc, which once recycled circuit boards on the site, then left behind a mess nobody wanted to touch.
So what actually made that ground usable again, and why did a solar company want it at all?
What was buried in that Maine soil, and why solar needed it clean first
The CGA site contained over 3,000 tons of circuit board waste, coated with copper and heavy metals, along with dilapidated buildings, an underground storage tank, waste pits, and contaminated soil and groundwater. Underneath the waste piles of circuit board shear trim, tires, wood, metal, rubber, plastic and concrete sat a layer of copper contamination leaching into the ground below.
In the acquisition, the city became liable for all environmental contaminants, mainly soil copper contamination from the copper coated wires in the circuit boards. That liability is what kept developers away so long, since no one could build on contaminated ground without a full accounting of what sat underneath.
That is the part a solar headline never mentions. The dirt has to pass inspection before the panels ever arrive on a flatbed truck.
How a town dug its way to a 17 acre power plant
Fixing the lot was not a quick patch job. The cleanup cost roughly $1.4 million, which came mostly from state and regional revolving loan funds, and brownfields multipurpose funding.
Crews hauled away a staggering volume of debris before a single trench could be dug for cable. Officials measured the scale of that cleanup in blunt terms.
“The site was covered in environmental hazards and was a nuisance to the surrounding community. Being able to remove 4,000 tons of waste and start the initial site work for a solar array has improved the whole area,” said Sanford Planning Director Beth Della Valle.
Once the ground was cleared, the project moved into a phase that looked like any other solar build: trenching, racking, wiring and inverters. But the site never stopped being what it was underneath, a former industrial scar now carrying different infrastructure entirely.
What the finished array actually delivers, and who gets the power
The completed system is modest by utility scale standards but significant for what it replaced. Nautilus Solar announced the completion of a 7 megawatt community solar farm on the remediation site, now fully operational and supplying renewable energy to more than 960 subscribers in Central Maine Power territory.
That is a sizable share of local households drawing power from land that once held hazardous drums. The farm sits on a patchwork of ownership that mirrors its messy history, combining city owned land with an abutting property belonging to the Maine Turnpike Authority.
Nautilus Solar is the long term owner of the facility. Few solar sites anywhere in New England carry that particular layering of public and private land under one array.
The arrangement works through Maine’s community solar structure, letting homes and small businesses subscribe to the output and save on electric charges without installing a single rooftop panel of their own.
Why Sanford wanted a solar corridor, not just one array
Sanford’s ambitions reach further than this single lot. The city identified a need for a solar energy corridor to support plans for revitalizing over two million square feet of former textile mills downtown, since those properties were deemed too small to support a large solar array.
To help promote sustainable redevelopment of the mills, the city created the Sanford Energy Redevelopment Corridor, and the CGA site became its proving ground. That connects this project to the kind of industrial power matching utilities increasingly lean on, where a solar farm’s output is earmarked for a specific redevelopment zone rather than sold into the open grid.
Sanford’s planners see the mill district’s revival and the solar corridor as the same project viewed from two angles. Henry Weitzner, chief executive of Walden Renewables Development, the firm that originally developed the site before Nautilus took over long term ownership, called the project a template rather than an exception.
“The transformation of the heavily contaminated CGA brownfield site in Sanford to a remediated site for a solar farm is a great success story and involved extensive collaboration with Maine DEP, the City of Sanford, US Army Corps and the Maine Turnpike Authority,” he said.
What this means for the next contaminated lot waiting somewhere else
Sanford is not an isolated case, and that is the real point. Brownfield solar has a track record elsewhere, including projects built specifically to move stalled land from liability into generation.
Federal brownfield programs increasingly treat solar as a practical reuse option for industrial land nobody else wants, according to the EPA’s own account of the Sanford corridor. Even so, the economics only work when cleanup costs stay modest relative to the land’s value once cleared.
Copper contamination is far cheaper to remediate than some heavier industrial legacies. A site with deeper soil contamination or ongoing groundwater plumes could easily cost more to fix than any array built on top of it would ever earn back.
None of that diminishes what happened on New Dam Road. A lot that spent thirty years as a dumping ground for discarded electronics now earns its keep making electricity, a quiet argument that the cheapest fix for some of the ugliest industrial land left behind is simply to cover it in glass and let the sun do the rest.
Hugo is an engineer with strong technical expertise. Multilingual from an early age, his writing combines technical clarity with a strong interest in science and energy.
