Solar and wind technology will never gain widespread acceptance until the cost comes down 50 - 60%. I have checked several sources and what you are essentially doing is pre-paying for electricity for 10 - 20 years. These companies are building into their sales pitches an 8 - 10% increase per year for the cost of electricity to try and convince people to swallow this as an investment. Even if one accepts these assumptions, the payback is 20+ years. Who in their right mind invests in this for the benefit of the next property owner. It seems as though a better investment would be in high efficiency hvac systems and energy efficient windows. The total cost is a fraction of what one of these 'renewable' systems cost and the benefits are immediate. While buying new systems is a sunk cost at least you will enjoy a more comfortable home and lower utility costs instead of paying in advance for unused electricity generation. Spare me the comparisons to investing in a swimming pool; pools are a luxury and not a commodity.