Solar water heaters and solar electric systems are both mature technologies that work great today. As with all technology, incremental improvements will occur over time, but the dramatic improvements have already occurred. Besides, solar is already affordable for most people and works great here in Chicago. Demand is growing as are fossil fuel prices. These pressures will keep solar prices rising steadily into the near future. The longer you wait to install a solar system, the longer you’ll delay saving month every month on your utility bills.