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PJM releases impact study for planned 1,060-MW Va. gas plant

PJM Interconnection estimates that about $11.1 million in transmission upgrades will be needed to interconnect a planned 1,060-MW combined-cycle natural gas plant in Charles City County, Va.

PJM released its impact study on June 7 following approval of the project by the Virginia State Corporation Commission. The SCC in a May 3 order approved a certificate of public convenience and necessity for C4GT LLC to construct and operate the Charles City CC Project.

C4GT, headquartered in Novi, Mich., filed plans fall 2016 to build the independent merchant plant, which will supply electricity to wholesale markets in Virginia and the surrounding regions. The combined-cycle plant will consist of two combustion turbines and one steam turbine with the natural gas supplied via a pipeline owned by Virginia Natural Gas Inc., according to the company's application.

C4GT said it in its application it plans to begin construction of the power plant in the fourth quarter. The proposed in-service date for the plant is June 30, 2020, according to PJM's system impact study.

The power plant will interconnect with the electric transmission system at Dominion Energy Virginia's Chickahominy substation in Charles City County. This work could involve an additional span of a 500-kV line between the power plant's substation and the Dominion switching substation, along with metering installation and other protection equipment at the generation substation, at an estimated cost of $4.2 million, according to PJM's study. The study also details about $6.5 million in work at the Chickahominy substation that includes a potential substation expansion to "accommodate the additional equipment and additional land," as well as additional permitting that may be needed.

There is an estimated $420,000 in additional costs that may need to be allocated for new system upgrades. The study notes that C4GT "may not be responsible for 100% of the identified network upgrade cost" because of other network needs, such as another interconnection request or merchant transmission upgrade.

Dominion Energy Virginia, known legally as Virginia Electric and Power Co., is a subsidiary of Dominion Energy Inc. (SCC docket PUE-2016-00104)