Exelon expansion Harford County

Exelon Generation plans at $122 million expansion of its Perryman electricity generating station, adding two more units fired by natural gas. (TED HENDRICKS | RECORD STAFF, The Record / November 6, 2013)

Exelon officials plan to expand a power plant in Harford County by building two additional natural gas-fired power generating units on utility-owned land off Chelsea Road in Perryman.

The project has an estimated price tag of about $122 million, an Exelon spokesman said.

The two Pratt & Whitney turbines have combined capacity to generate 120 megawatts of power, or 60 megawatts per unit, said Robert Judge, regional manager of communications for Exelon Power.

The generators will be built on nearly nine acres, Judge explained.

He was among several Exelon officials who attended a hearing before the Harford County Development Advisory Committee in Bel Air Wednesday morning.

"This is part of our merger commitment to provide clean energy in Maryland," Judge said.

Exelon, headquartered in Chicago, is the parent company of Constellation Power Source Generation Inc. of Baltimore, the parent of BGE.

Regional power generating entities also under the Exelon umbrella include the Conowingo Dam across the Susquehanna River and the Peach Bottom nuclear facility in Pennsylvania.

Exelon and Constellation merged in 2012, and company officials made a commitment to increase sources of clean energy generation in Maryland.

Tammy Sanford, principal environmental project manager with Exelon, said after the committee hearing that the "dual-fuel" generators run primarily on natural gas; No. 2 diesel fuel can be used as a backup source.

She said Exelon officials had committed to building 120 megawatts of new gas-fired generation infrastructure in Maryland.

Rowan Glidden, vice president and director of land planning for George William Stephens Jr. and Associates Inc. of Belcamp, presented the site plan for Perryman No. 6, which will be built on 8.96 acres next to the existing Perryman No. 51 facility, which also has dual-fuel generators.

The existing facility is off Chelsea Road, along the Bush River and the edge of Aberdeen Proving Ground.

Constellation is listed as the property owner on the site plans, and Exelon Power is listed as the developer.

The land is zoned GI, or general industrial; it will be served by public sewer and private well water, according to the plans.

Judge said the entire Constellation property covers 704 acres, and facilities on the property have a combined generating capacity of 355 megawatts.

Harford County Planning and Zoning officials had plans on file from several years ago, when utility officials proposed building additional generators on the Perryman property.

Sanford said the original site plans, which were approved by Harford County, called for 10 generators, but the site plans that were presented to the committee Wednesday had been redone and scaled down to two generators.

"It was a totally different project," she said of the 10-generator proposal.

Sanford said the original project had "stalled out."

"It was coincidence it was in the same location," Glidden said of the new project.

Committee members had few comments on the site plan during Wednesday's meeting, which lasted eight minutes.

Darryl Ivins, a civil engineer with the county's Division of Water and Sewer, noted public works officials would be speaking with the property owners about placing sewer lines along Chelsea Road.

Development Advisory Committee Chairman Moe Davenport said after the meeting that he expected the project could move forward in light of the county's approval of the prior plans to build on the site, and Exelon could begin the permitting process once Planning and Zoning approves the site plans.