Facebook is planning to create both electricity and hot water with a solar energy system at its new Menlo Park, Calif., headquarters.

With the capacity to generate 10 kw of electricity and 50 kw of thermal energy, the system from Cogenra Solar is relatively small. But its dual function makes it more cost-effective than a PV-only solar system, according to Cogenra CEO Gilad Almogy, quoted in the San Francisco Chronicle.

The 24-module system will sit on the roof of Facebook’s 10,000 square foot fitness center, powering exercise machines and heating water for showers. The center is one of nine buildings on the 57-acre campus, which once belonged to Sun Microsystems. Facebook employees will complete a transition to the new campus next month.

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