There is no such thing as the perfect energy source, and an unforeseen consequence of the solar-panel array at Manchester-Boston Regional Airport proves that installing solar panels can be a tricky business. The airport has had to shut down about a quarter of its panels after getting complaints from air-traffic controllers about glare.

How do you shut down a solar panel? Drape it in black tarp.

The glare is only a problem for about 45 minutes every morning when it hits the air-traffic control tower, and so far the controllers are alone in their complaints – no aircraft or airline has voiced a concern. But the airport is committed to finding a solution – whether to change the panels’ tilt, add blinds to the tower, or something else entirely, and is expected to find one within 90 days.

The solar project cost $3.5 million and was 95 percent funded through a Federal Aviation Administration Voluntary Airport Low Emissions grant. It is expected to save the airport $100,000 a year on its electricity bill, paying for about 30-40 percent of the electricity used to power just the garage.

The airport worked with the consulting firm of Harris, Miller, Miller & Hanson, which had specifically assured officials there wouldn’t be a glare problem, according to Brian O’Neill, deputy airport manager.

In a statement, the FAA said, “The FAA and Manchester-Boston Regional Airport officials are developing a plan to eliminate glare from a solar array on the airport parking garage. Airport officials have covered the solar panels as an interim measure until a permanent solution is in place.”

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