that your power comes from a source that is clean and renewable, and which gives you high savings in the long run. In addition, any energy derived from fossil fuels (most electricity is produced by burning oil, gas, or coal) will continue to go up in price. 

No.4
Question: What is the total cost involved?
Answer: The upfront cost for installing a solar hot water system is about $3,000-9,000. A solar electric system costs between $10,000-40,000. Solar heating varies in cost, starting from $1,000. There are, however, tax credits and savings incentives that can help to offset the upfront costs.