Great strides are being made with solar technology. Solar panels are decreasing in price and becoming more efficient. The problem with solar energy is that when the power is generated during the day, with the exception of heating water, it is not when it is needed. During the next three years, we will see huge developments with improved battery technology, which will enable us to store this energy at an economical cost and then use it when it is needed. The residential solar power industry is about to go through the same process as mobile phones did in the mid-1980s, few people had them initially, but ten years on they became ubiquitous.