Retrofits & Upgrades

ISO-NE approves deactivation of New Boston Unit 1

11 July 2007 — The Independent System Operator New England (ISO-NE) has approved the deactivation of New Boston Generating Station’s Unit 1, effective August 1, 2007. Activities relating to the deactivation of Unit 1 are expected to take at least four months.

“Our decision to deactivate Unit 1 is based purely on economics,” said Mark Schiavoni, Exelon Power President. “Without the Reliability Must Run (RMR), Unit 1 at New Boston is not profitable.”

New Boston was party to an RMR with ISO-NE from Jan. 1, 2002 until Nov. 15, 2006, under which the station was used to ensure reliability within the regional power grid during periods of high-energy demand. Various upgrades to the power grid have resulted in a decreased need for Unit 1 at New Boston. Since Nov. 15, 2006, the New Boston station has been operating as a merchant plant.

Initially built in 1965, New Boston Unit 1 is a 350-MW natural gas intermediate unit. Unit 2, which was capable of producing 350 MW, was damaged in a fire in 2002 and is no longer in operation.

Exelon Generation is assessing future potential use of the property and facility and has not made a decision about the future of the New Boston site. Until a decision is made, Exelon will maintain the site as it has done for other deactivated/decommissioned sites.