Green, Eco Friendly Class A Monoblocks

Besides lowering the power demand of your amps (e.g. Class D), you may want to look into the solar policies wrt the local power company. In some locations, the power company is required to buy back energy generated by solar, and a simpler solar (or wind) system can be installed that doesn't use battery storage but just pushes power back into the grid. This can sometimes be most cost effective and green. Honestly, if you are building a new house or planning major renovations, you can probably make a whole lot more green impact by going for other energy efficient designs for heating/cooling (e.g. heat pumps, passive solar, solar water heating, efficiency via insulation) than by focusing on your stereo. If you're not willing to do Class D amps, there's not much you can do to reduce the consumption. One advantage of a battery bank, if you're going to spend the money, is that you might be able to have your equipment modified to run directly from the battery banks (i.e. no AC noise). As Marco mentioned above, Ralph at Atmosphere would have some good ideas in that area.

T_bone - I've been studying ground source heat pumps lately. They are very efficient, and a form of geothermal. They require either buried shallow loops of tubing in the ground or wells.

Hi T_bone,

You're right, they just generate heat, not electricity. If you are going closed loop, I'm not sure of the trenching depth that gets you pretty well far away from the seasonal and diurnal temperature fluctuations at the surface - a borehole definitely does that. Even more efficient (and costly) is an open loop system using two wells, where groundwater is extracted, heat exchanged, and reinjected. It gets you up to an efficiency factor of 4 rather than the low 3's with a closed loop system (for those wondering, efficiency factor means for every 1 watt of energy you put into the system you get 4 watts of heat out of the system).