Caller (a woman) claimed to be from NRG, "a state-funded program" that would install solar on my house if I qualified; she correctly identified NRG as being based in New Jersey, but sounded fishy beyond that.  I told her no, thanks, and hung up.  Interestingly enough, call return doesn't work for that (spoofed) number.  I'm on the DNC list, so she shouldn't have called in the first place.  NRG _is_ a legitimate solar company, based in NJ, but I checked with them, and I'm not on their contacts list.