My favorite renewable is geo-thermal. I just read a post
in the heat and air/conditioning section that asked about geo----every responce was positive. It really is the best renewable available to the new home builder. Solar costs too much, wind is impossible---but using the 55 degree temperature of the earth for heat, a/c and domestic hot water is not only possible it is the right way to go. No outdoor equipment to be vandalized, no maintenance for years, no emissions into the atmosphere, no carbon monoxide emissions to jeopardize the health and welfare of the household. I call it a process of elimination---no chimney, no outdoor equipment, no maintenance contract, no problems.
Geothermal pays for itself in a short time and if you talk to the right people at the bank you can get a larger mortgage or a lower mortgage rate for using such a great energy saving system.