Post Content

Secretary Richard K. Sullivan Jr.

Secretary Richard K. Sullivan Jr.

Secretary, Executive Office of Energy and Environmental Affairs
Executive Office of Energy and Environmental Affairs

View Secretary Sullivan's Bio

The Massachusetts Water Resources Authority’s (MWRA) Deer Island Wastewater Treatment Plant has played a huge part in helping to clean up Boston Harbor, but I’d also like to recognize it as one of Massachusetts’ great renewable energy and energy efficiency achievements. Just this last May, Deer Island was awarded the Energy Leadership Award by the United States Environmental Protection Agency (EPA).  Using renewable energy and energy efficiency measures, the plant treats an average of 350 million gallons of wastewater each day and removes human, household, business and industrial pollutants from 43 communities in Greater Boston.

Deerisland

Today more than half of the plant’s energy demand is provided by on-site, renewable generation. 

I took a tour of the plant this summer and learned it is one of the largest electricity users in the Northeast, which is why the MWRA sought energy efficient alternatives. The plant energy demand is 18 megawatts and the electric bill around $16 million annually.  The plant now self-generates 22 percent of its electricity needs with ground and roof-top solar photovoltaic systems, wind turbines, hydro-electric generators that capture water as it drops from the plant into the outfall tunnel shaft, and digester gas-derived electricity generated through steam.  The island’s renewable energy now saves MWRA $4 million a year, or 25 percent.   

Two 600 kilowatt wind turbines were installed on Deer Island in November 2009.  They currently generate over 2 million kilowatt hours (kwh) per year and save around $200,000 annually.  A third 100 kilowatt prototype wind turbine was installed this spring by Massachusetts-based FloDesign. It is the first full-scale wind turbine the company has produced.  Its newfangled turbine design is supposed to generate 30 percent more electricity at lower wind speeds than convention wind turbines.     

The plant recovers energy as the flow of treated wastewater drops from the plant into the outfall tunnel shaft through two 1-megawatt hydroelectric generators.  These generators produce over 6 million kWh of electricity per year and save over $600,000 in electricity costs.

Of the 350 million gallons of sewage the plants treats daily, the island’s anerobic digesters are able to use the methane from the sludge as fuel, saving about $15 million a year.  While it also generates energy, the sludge is pelletized to become fertilizer at the MWRA’s Nut Island plant in Quincy, is given to cities and towns served by the Authority, and sold to turf farms. 

MWRA is also in the midst of a multi-phased lighting project (it’s currently 80 percent complete) that involves changing out motion sensors, exit signs, ballasts, and lamps.  They also had an energy assessment done by NSTAR and as a result put 75 percent of the lighting on the island on automatic shut off, which saves about $1.5 million annually.  

It’s a premiere example of how integrated clean energy solutions are taking us closer to our goals to cut greenhouse gas emissions, energy use and energy costs.  

Written By:

Recent Posts

Comparing Homes – Energy-Saving Enters the Equation posted on Aug 28

Comparing Homes – Energy-Saving Enters the Equation

Until recently, there was no way to easily figure energy efficiency into a home buying decision. Enter HomeMPG, a Massachusetts energy-saving initiative to pilot an energy performance score (EPS) in residential homes. This “asset” rating that’s analogous to a car’s MPG rating. Behavior is taken out of the equation so that any home’s energy use can be compared to any other home, allowing for an apples-to-apples comparison.

Massachusetts Milestone: 15,000 Solar Installations posted on Aug 25

Massachusetts Milestone: 15,000 Solar Installations

Massachusetts has just surpassed an exciting milestone of 15,000 solar photovoltaic (PV) installations, proving that solar energy has become a smart, popular choice here. In fact, as of August 21, there were 15,762 systems installed across Massachusetts, a twenty-fold increase from 2007 when Governor Deval   …Continue Reading Massachusetts Milestone: 15,000 Solar Installations

Solarize Mass – Big Scale Impact for Small Scale Solar posted on Aug 20

Solarize Mass – Big Scale Impact for Small Scale Solar

The results of the Solarize Mass 2013-2014 two rounds managed to surpass numbers from the previous two years. Close to 1,500 contracts were signed and a total of nearly 10 megawatts of solar installed. During 2013’s first round, ten communities participated, and for the second round that ended this past June, another fifteen communities were chosen.