The LA Times had a story about a neighborly spat over shade trees v. solar panels. Apparently, the Shade Control Act in California prevents shade trees from blocking more than 10% of sunlight from a solar array:
It protects homeowners' investments in solar panels, which can cost tens of thousands of dollars. Property owners whose trees block the sun from more than 10% of their neighbors' panels can be fined as much as $1,000 a day if they refuse to trim them.
Although GBL has not heard of this particular strain of litigation before, NIMBY issues are not new to solar installations. See here for a story on local zonign laws which originally prevented Al Gore from installing solar panels on his Tennessee home.