Wow, Cambridgeport would be such a nice place to live, especially having a condo out there! If you're looking for ways to have green energy to not use as much energy on a daily basis, it can mostly be due to cool or hot air seeping through your windows and doors. Just having those small cracks that aren't sealed right, or having windows that don't retain the temperature of the inside air can really take a tole on your energy bill. I'd suggest to get new windows and ask for energy efficient windows to keep the good temperature in and the bad ones outside. Once you get the windows installed, another way to save on energy is to use drapery and shades to block the window as well. Those two things will attribute to a green energy solution!