Customer Parallel Generation - Interconnection

What is Parallel Generation?

Parallel generation refers to a generator that produces electricity while it is connected to the electric grid. Your electrician or consultant can tell you whether your generator will operate in parallel.

Generator Interconnection

You must obtain permission to interconnect your parallel generator to Dominion’s electric grid.  There are important steps to follow to ensure proper and safe interconnection.  Interconnections must be individually accepted and inspected prior to beginning parallel operation.

There are several options available for interconnecting your parallel generator, including net metering or selling the generator output. Specific requirements will vary depending on whether your project is located in Virginia or North Carolina, and whether it is a distribution or transmission interconnection.  Please see Frequently Asked Questions (FAQ) for definitions and additional information about interconnection options.  Overview – Interconnection Steps provides a listing of the basic steps for interconnecting your generator.

Operating in Parallel for Two Seconds or Less

If you are installing generation that will operate in parallel for two seconds or less, please consult Dominion’s Blue Book - Information and Requirements for Electric Service.  Section 190 of the Blue Book has information regarding customer generation.  Parallel operation of two seconds or less is considered a "closed-transition" or "make-before-break transition" of electrical load from one power source (e.g., your generator) to another (e.g., Dominion’s electric grid).  For such a closed transition, Dominion does not apply the interconnection plans outlined below, which address longer duration parallel operation.

Operating in Parallel for More Than Two Seconds

If you are installing generation that will operate in parallel for more than two seconds, your options include net metering under state jurisdiction, or interconnecting for the sale of power under the applicable federal or state jurisdiction. Since determining federal and state jurisdiction can be complex, any questions regarding the appropriate jurisdiction will be addressed after you provide the details of your interconnection request. 

Net Metering

If your generator is fueled entirely by renewable energy you may be able to sign up for net metering, where any power in excess of what you consume is fed back to the electric grid to offset future electric use.  The maximum renewable generator size to be eligible for net metering in Virginia and North Carolina is as follows:



North Carolina



All Customer Classes

20 kW

500 kW

1000 kW

To learn more, see the Net Metering Terms and Conditions for either Dominion Virginia Power or Dominion North Carolina Power, or or visit the Net Metering homepage.

Interconnection Under Federal Jurisdiction

Many interconnections to Dominion's distribution system involve federal jurisdiction. Since all requests involving federal jurisdiction are processed by PJM Interconnection, you should initially contact PJM about your request. Depending upon the characteristics of your interconnection, PJM will either process your request or suggest that you contact Dominion to process your request under state jurisdiction. PJM Interconnection is the regional transmission organization (RTO) that administers many of the interconnections to Dominion’s system in accordance with the PJM Open Access Transmission Tariff (OATT).  Additional information about PJM Generator Interconnection Procedures is available on the PJM website.

Interconnections to Dominion’s transmission system must also comply with the Dominion’s Facility Connection Requirements.  Additional information about Dominion’s electric transmission system including PJM OATT, informational postings/notices required by Federal mandates, and electric transmission planning and statistics are available on the Electric Transmission web page.

Interconnection Under State Jurisdiction

If your interconnection does not involve federal jurisdiction, your request will be processed in accordance with the appropriate state requirements.  To initiate a request for either Virginia or North Carolina, prepare a complete interconnection request as provided for in the appropriate state rules and submit it to the Dominion address shown below (under "More Information").

Dominion Virginia Power

State jurisdictional interconnections In Virginia are subject to the Regulations Governing Interconnection of Small Electrical Generators, in Chapter 314 of the Virginia Administrative Code and Dominion’s Virginia Terms and Conditions regarding interconnections.  In general, generators are distinguished by size: 500kW or less; over 500 kW to 2 MW; and over 2 MW to not more than 20 MW.

Dominion North Carolina Power

The North Carolina Interconnection Standards provide information, application forms, and requirements for interconnection and parallel operation of customer owned generating facilities in North Carolina.  In general, generators and the associated interconnection procedures are distinguished by size:  10kW or less; over 10 kW to 2 MW; and over 2 MW.

More Information

For more information on generator interconnections or parallel operation, call (804) 775-5658, e-mail, or write:

Generator Interconnections
Dominion Virginia Power/North Carolina Power
One James River Plaza, 8th Floor
P.O. Box 26666
Richmond, Virginia 23261-6666

NYSE : (April 17, 2014) D 70.67 -0.86