American Family Insurance is undertaking the largest solar panel rooftop installation ever in Wisconsin, putting in close to 4,500 solar panels at its national headquarters building in Madison.

A Madison-based commercial solar developer, SunPeak, is partnering with American Family on the project, which is expected to finish up in two or three months.

Once complete, the installation is estimated to produce 1.26 million kilowatts each year — enough to power about 122 homes for a single day. It would offset electricity use at the facility by up to 9 percent, saving around $191,000 in annual energy costs.

The insurer recently installed high-efficiency lighting in all its offices and redesigned its kitchen refrigeration systems to save over 4.5 million gallons of water a year.

“American Family Insurance has made a commitment to sustainability by implementing projects and initiatives that protect our environment and contribute to the well-being of our communities,” said Dan Rosetta, American Family Insurance facilities operations director.

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