PV Solar System Tracking

Department of Public Works Rooftop Solar

In 2023, Columbia County replaced the roof and installed a rooftop solar array at the Department of Public Works building on Route 23-B in Greenport.

The solar array is rated for 186 kW (DC) /150 kW (AC). While the annual electric use at the DPW building is about 78,000 kWh/year, the estimated production of the solar array is 220,639 kWh/year. The excess production at the DPW site will be used to offset electric utility costs at other county owned buildings. It is anticipated that this solar system will save the county over $20,000 in electric utility costs annually, and reduce greenhouse gas emissions (CO2e) by about 146 metric tons per year.

Installation of this solar array includes an internal cloud-based monitoring system. The solar panels were connected to the grid and began producing electricity for the county on December 1st.

The public dashboard below shows the electric production of the system for various time frames.

The orange line shows the electric power being produced, measured at the inverters. The blue bars show the electric power being produced, measured at the meter.