The 400kW photovoltaic (PV) system, valued at $2.5m, will be deployed using 125,000sq ft of roof on the high school at Farmington Hills .

The solar array is expected to be operational this fall after design and construction is completed.

The installation is part of DTE Energy’s pilot SolarCurrents program that calls for photovoltaic systems to be installed on customer rooftops or property over the next four years to generate 15MW of electricity throughout Southeast Michigan.

DTE Energy plans to invest about $100m in the program, in which customers participate for a 20-year period, and will own, operate, install and maintain the solar energy systems.

Mercy High School and other customers that participate will get an annual credit on their energy bills, as well as a one-time, upfront construction payment to cover any inconvenience during installation.