All the maintenance and repair is done by the company who installs the panels. There are no moving parts, and the inverter(s) are the only things that they have to worry about, really.
The sun melts the snow and the glass is slick, and it slides off fairly easily. The open air flow is actually a good thing in the hot weather by keeping the panels cooler, which makes them a little more efficient.
This site is a capped landfill that is required to be open and can't have any trees. We should be covering any and all flat roofs, and put canopy roofs over any and all parking lots - and we will have more electricity than we know what to do with.
The company that is leasing the use of the space is paying for the installment and the maintenance, etc. Wicked Local has this info:
http://www.wickedlocal.com/maynard/news/x320405856/Landfill-project-moves-forward-in-MaynardI was not remembering the output correctly - it is less than I thought it is. The total capacity is ~1MW and the site is 14 acres. According to the article, the output is only enough for part (~25%) of the town's buildings. That doesn't sound right though - it should be enough for about 200 homes. If the town buildings are using as much electricity as 800 homes, I'd like to know why it is that much.
I also think that the article badly misstates the total annual output. A 1MW system can put out as much as 12MWh per day, so that would total ~4.3GWh per year. (Maybe my math is off?)