Wastewater Energy Initiatives

Wastewater treatment facilities typically have the highest energy use in most communities. The Hall Street Wastewater Treatment Plant is one of the largest energy users in Concord and uses approximately 300 kilowatts (kW) per day. Yet, it is one of the most energy-efficient treatment facilities in the state. 

An energy audit was completed several years ago at this facility to identify measures to produce energy savings. Many facility upgrades have been made over the recent years to improve energy use, including variable frequency drives, new high-efficiency blowers, plant water pump replacements, LED lighting upgrades, HVAC improvements, building weatherization, and the installation of a new solar panel array. 

Solar Panel Array

A photovoltaic solar array of 136 panels has been installed at the Hall Street Wastewater Treatment Plant by Kearsarge Solar. Construction activities started in the summer of 2024, and panels were activated on January 13, 2025.

Total project costs of $250,000 were covered by a grant funded by the New Hampshire Department of Environmental Services under the American Rescue Plan Act (ARPA).

The installation of solar panels is an energy-saving initiative by the City of Concord. The solar system has a capacity size of 60 kW with peak daily production typically around noon. This system will generate a portion of the wastewater facility’s energy requirements and save some money on future energy bills.

Solar Virtual Kiosk Dashboard

View our Virtual Kiosk Dashboard to see the City of Concord’s solar array performance.