Mattawoman Energy firming up details for 859-MW gas project

Mattawoman Energy LLC, which is developing an 859-MW, gas-fired, combined-cycle project, has lately engaged in further planning and design of the project’s linear facilities, including the electric interconnection with Potomac Electric Power (PEPCO).

Company representatives on June 30 provided updates to the Maryland Public Service Commission on the status of the project, which has been under consideration for a PSC approval since July of last year. This case is working under a May schedule revision that calls for a final commission decision on or around March 16, 2015.

Steven Tessem, the Vice President for Business Development for Panda Power Funds, the parent company of Mattawoman Energy, said the linear facilities being worked on are: the interconnect to the electric transmission system, which is owned by PEPCO and operated by PJM Interconnection; the water connection with the Piscataway Wastewater Treatment Plant; and the gas lateral connection from the project to Dominion Cove Point LNG LP’s natural gas pipeline. The Mattawoman plant site is in Prince George’s County, Md., fairly near Dominion’s to-be-expanded Cove Point LNG terminal on the Chesapeake Bay.

Also, on Jan. 22, Mattawoman received a new “Determination of No Hazard to Air Navigation” from the Federal Aviation Administration for the exhaust stacks at the Mattawoman project. A copy of this determination is attached to the June 30 filing.

The Maryland National Capital Park and Planning Commission also unanimously approved the Mattawoman Project with conditions in October 2013. A copy of this approval is also attached.

Finally in terms of progress lately, Mattawoman submitted a completed application to the Maryland Department of the Environment for construction dewatering.

Mattawoman now expects to commence commercial operation of this plant by the second quarter of 2018. Mattawoman also intends to participate in PJM’s Reliability Pricing Model, beginning with the Base Residual Auction to be conducted in May 2015 for the 2018/2019 Delivery Year.

Mattawoman, PEPCO work on interconnection changes

While Mattawoman concluded PJM’s interconnection study process and signed an Interconnection Service Agreement (ISA) and a Construction Service Agreement (CSA) at the end of last year, PEPCO declined to countersign the ISA or the CSA and requested that a different interconnection configuration be studied, Tessem noted. Instead of interconnecting to the Burches Hill substation via the existing 230-kV transmission line owned by PEPCO adjacent to the Mattawoman project, PEPCO has asked that the Mattawoman project interconnect with the Burches Hill substation via a new 230-kV transmission line to be permitted, constructed, and owned by PEPCO.

PJM Interconnection will operate the line. This new interconnection configuration will eliminate the need for an eight breaker ring bus at the project switchyard and the generator lead line. As before, the point of interconnection will be adjacent to the Mattawoman Power Island. PJM is currently updating the Facilities Study to reflect this new configuration, and Mattawoman expects that a revised Facilities Study Report will be issued in September 2014.

PEPCO has confirmed with Mattawoman that PEPCO will be responsible for permitting and environmental review associated with the new interconnection line, Tessem added. PEPCO also has confirmed that it will file a certificate of public convenience and necessity (CPCN) application with the commission to construct the line.

Mattawoman has settled on a preferred route for the natural gas pipeline route and is currently entertaining proposals from several parties. The route begins at the Gatehouse connection to the Dominion Interstate gas line, crossing through three private commercial properties. From there the route follows the PEPCO 230-kV property/easement to the intersection with the PEPCO 500-kV easement and travels west along the PEPCO 500-kV easement to the south on Prince George’s County land. It then crosses the CSX Transportation railroad and continues to the northeast along an existing Southern Maryland Electric Cooperative easement. The gas line again crosses the CSX railroad and enters the Mattawoman site. The entire route is 6.7 miles.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.