Solar Farm on the former Greenwood Street Landfill

Particularly noteworthy due to its size is a large-scale solar installation at the former (capped) Greenwood Street Landfill.

The 8.1 MW-DC solar array, covering the entire top plateau area of the former landfill (about 25 acres), is the largest municipal solar array in New England to date, producing electricity equivalent of powering 1,340 homes for a year*!

This project is both an appropriate reuse of a large municipal property that is a former landfill and will be profitable, with an anticipated 6-year payback on the investment.

The flip-the-switch ceremony took place on August 17, 2017

Finances: The solar array is municipally-owned which allows the City to take advantage of selling the Solar Renewable Energy Credits (SRECs) and selling electricity at the valuable net-metering rates. The project was enabled by the Energy Savings Performance Contract. The total project cost is ~$27 million with the payback of about 6 years, in part due to a much higher value of SRECs in the beginning of the term. Using conservative estimates, the City will recoup ~$52 million over the 20 years of the project, and ~$17 million more during the subsequent 10 years, since the array’s life expectancy is 30+ years.

Interesting Facts:

  • There are 1,430 racks holding up 20 solar panels each – for a total of 28,600 solar panels!
  • The racks with panels are ballasted with concrete blocks to avoid penetration of the landfill cap.
  • Solar panels’ tilt angle - 25°; azimuth - 180° (i.e. due south).
  • Solar panels are also referred to as "Monocrystalline Solar Modules"
  • Project Manager and Engineer is Borrego Solar Systems Inc.
  • All contractors are part of local unions – electricians, engineers, heavy machine operators, and more - with majority coming primarily from Central and Eastern Massachusetts.
  • Learn more by clicking on the solar panels’ specification sheet to the right.

 *Assuming ~ 9,890,000 kWh for the first year of electricity production and 7,380 kWh/year of residential electricity consumption in Massachusetts.

View more information on the solar system and its electrical production at (city's energy monitoring provider and independent verifier of produced energy).