The new Annie E. Fales Elementary School, a K-3 grade school in Westborough, Massachusetts is projected to achieve net-positive energy use when it opens in Fall of 2021. The school’s ground-floor public spaces—the cafetorium, gymnasium, and administrative offices—are built into the hillside to reduce heat loss and gain through exterior walls. Rooftop monitors and solar panel arrays harvest both daylight and solar energy, while 40 geothermal wells assure the building operates entirely on electric energy. Westborough is also working with National Grid to establish a net-metering contract. This will allow the school to off-load excess energy generated in the summer and draw electricity in the winter