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With costs between $2,500 and $4,000 and a payback period of one to seven years, the U.S. Department of Energy says that “solar pool heating is the most cost-effective use of solar energy in many climates.”

3. Thin-Film Panels Made from various materials, including cadmium telluride, thin-film panels are lightweight and flexible. They tend to be the most affordable option but come with lower efficiency rates. Pricing can range from $0.50 to $0.80 per watt.

Technicians usually install a distributed solar PV system on the rooftops of homes or businesses. These solar power systems generate electricity to offset the property owner’s usage and send any excess production to the electric grid.