Exelon is planning to expand the Medway station by adding two natural gas turbines, enabling the plant to operate as one of the cleanest peaker plants in the nation.

Power Generation

  • Adds 200 MW of electricity to the local electric grid during times of peak demand.
  • Fueled by natural gas, with ultra-low sulfur diesel (ULSD) as a backup for no more than 30 days per year.
  • Reduces CO2 emissions by 40 percent during operation when displacing older coal and oil burning units.

Infrastructure

  • Two GE LMS100 combustion turbine-generators – the most efficient simple-cycle natural gas technology available.
  • One combined building that houses office, warehouse and maintenance space.
  • Supporting structures that include two 160-foot-high exhaust stacks; aboveground storage tanks for ULSD, water and emissions-control additive (aqueous ammonia); emergency generator and fire pump engine and connection to nearby gas pipeline.

Environmental Protection

  • Water required only for emission controls, and supplied by on-site well in combination with municipal purchases outside of Medway.
  • Reduced emissions that not only meet all air quality standards, but are well within limits considered safe for the most sensitive of populations (such as the elderly and small children with asthma).
  • Multiple layers of noise protection and construction within plant boundaries, which will remain largely blocked from view by existing barriers and tree lines.

Economic Impact

  • Estimated > $2 million in tax revenue per year, making Exelon the highest tax payer in Medway.
  • 200 jobs during construction, and 4-5 full-time positions.
  • Additional benefits to Medway through a Host Community Agreement.

2013 New England Peak Fuel Mix

PEAKERS PICK UP THE LOAD WHEN WE NEED IT THE MOST, AND QUICKLY
PEAKERS PICK UP THE LOAD WHEN WE NEED IT THE MOST, AND QUICKLY

In the summer of 2013, New England registered one of the hottest days in recent records. This graph shows the mix of fuels used by peaker plants to meet the excess electrical demand that day. When renewable energy isn’t available due to lack of wind or sunshine, clean burning natural gas is reliably available. As older coal and oil plants continue to retire, natural gas will play in increasingly important role in our transition toward renewable energy.

Graph Source: ISO Generator Interconnection Queue (June 2015), FERC Jurisdictional Proposals Only

Aerial View of Expansion

Click the image to view a larger version of the aerial view.
The proposed expansion (shown in blue) will add two gas-fired turbine-generators in the southeastern portion of Exelon’s property on Summer Street. Click the image to view a larger version of the aerial view.

Schedule

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Project Frequently Asked Questions (FAQ)

Exelon Generation, which owns and safely operates the West Medway peaking plant on Summer Street in Medway, is seeking an expansion of that facility to help meet future energy demand in New England. The expansion will include two new, state-of-the-art generating units that will feature clean air technologies with minimal water use. The following are links to key issues and answers to frequently asked questions.

The Expansion

View key issues and answers to frequently asked general questions on the expansion.

Energy

View key issues and answers to frequently asked questions on energy.

Sound and Visuals

View key issues and answers to frequently asked questions on sound and visuals.

Fuel

View key issues and answers to frequently asked questions on fuel.

Environment

View key issues and answers to frequently asked questions on the environment.

Additional Information

Find out how you can request additional information.

What Is a Peaker Plant?

Peaker plants deliver energy when the demand for electricity exceeds that provided by base-load power plants (those that run all the time and provide most of the region’s electricity). This typically happens during the hottest and coldest times of the year. Unlike base-load facilities that may take several hours to start up, peaker plants must start up quickly (the newest models such as those proposed for Medway come on-line in about 10 minutes).

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