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Our Guidelines
Standards & Requirements
Standby Generator Process
DESC's Standby Generator Interconnection Standard contains the requirements, in addition to applicable tariffs and service regulations, for parallel interconnection to Dominion Energy South Carolina, Inc. (“Dominion Energy”) by non-utility owned standby generation systems, which have a capacity of 200 to 2500 kW and utilize closed transition switches for normal operation, for the purpose of load testing no more than once a month (“Standby Generators”).
Fast Track Process
Eligibility depends on the type and size of the generator, voltage of the line and location of the Point of Interconnection. Generators greater than 2 MW or not connecting to DESC's Distribution System are ineligible.| Generator Capacity | Application Fee |
|---|---|
| > 20 kW to 100 kW | $250 |
| > 100 kW to 2 MW | $500 |
| ≤ 20 kW that exceeded the reserve circuit phase capacity requirement | $100 |
Study Process
In accordance with Section 5.3.1 of Appendix DESC CS of the South Carolina Generation Interconnection Procedure (SCGIP), DESC will begin taking applications during its yearly DISIS Request Window on April 1st until August 29th. Applications must be submitted via PowerClerk. If there are any questions about the PowerClerk website, please call the DESC Generation Interconnection Team at 803-217-2175.
This process is followed for all interconnection requests that are ineligible for or fail the Fast-Track Process.
| Generator Capacity | DISP Application Deposit |
|---|---|
| 1 MW or less | $10,000 + $1 per kWac of generator capacity |
| > 1 MW and < 20 MW | $20,000 + $1 per kWac of generator capacity |
| 20 MW to 50 MW | $35,000 + $1 per kWac of generator capacity |
| >50 MW | $50,000 + $1 per kWac of generator capacity |
Steps for Interconnecting
- SC Generator Interconnection Procedure
You can learn about the Pre-Application in Section 1.2 and the Fast Track Process in Section 3.
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Appendix DESC CS to the SC Generator Interconnection Procedure
Learn about applying for the Transitional Study Process in Section 3 or requesting an Informational Interconnection Study in Section 4.
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Dominion Energy Customer Guide
Review this summary of the South Carolina Generator Interconnection Procedure (SCGIP)
- Pre-Application Request (Optional)
Complete this optional Pre-Application Request form to receive valuable information on the Dominion Energy system at your desired Point of Interconnection. This helps you conduct a preliminary evaluation of your site without incurring the expense of preparing a full Interconnection Request.-
Application Fee is $500
-
Application Fee is $500
- Informational Interconnection Study Request (Optional)
Complete this optional Informational Interconnection Study Request form to evaluate different options (such as different sizes, sites or voltages) before entering the Definitive Interconnection Study Process. This helps you conduct a preliminary evaluation of your site without incurring the expense of preparing a full Interconnection Request.- Application Fee is $10,000
You should email either of the above completed forms to: SCElectricTransmission@DominionEnergy.com.
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Generation Interconnection Request
Register for an account at the DESC Generation Interconnection PowerClerk Website for Generating Facilities Greater than 20 kW and complete the “New Generation Interconnection Request”, which is a guided application process. All required fields/documents must be completed before submitting the application, this includes the authorized representative's signature.
The Application Fee / Deposit is based on the size of your project and the interconnection process applied under, as shown above:
- Pay online ($3.50 Convenience Charge per transaction) via Paymentus if you have an account with DESC;
- Pay via ACH/Wire (call 803-217-2175 to receive wire payment information);
- Or mail your check to:
Dominion Energy SC – Transmission Support Team
220 Operation Way, Mail Code J36
Cayce, SC 29033
The queue number is used to determine the priority for interconnection service and the cost responsibility for the upgrades necessary to accommodate the interconnection. A lower queue number will be studied prior to a higher one.
Whether your project is eligible for Fast Track treatment or will require a more in-depth Study, your Interconnection Request will move through the processes covered by Sections 3 and/or 4 of the SCGIP to determine what facilities or upgrades may be required, leading to an Interconnection Agreement.
After testing, and upon successful inspection by Dominion Energy, receive final approval from Dominion Energy to energize your system.
You may now begin commercial operation.
Documents & Resources
Frequently Asked Questions
Pre-Application Requests are optional. However, a Pre-Application Report can provide valuable information on the Dominion Energy system that can be utilized to evaluate interconnection sites without incurring the expense of preparing a full Interconnection Request.
Pre-Application Reports provide only a snap-shot of the requested portion of the Dominion Energy system at the time of the report. A Pre-Application Request does not establish a queue position in the Dominion Energy Interconnection Queue.
If your project fails the Fast Track Process, it can be evaluated under a Supplemental Review Process or the Study Process, whichever is applicable to your specific project.
Fast Track Application Fees are intended to offset Dominion Energy’s cost of evaluating interconnection requests. Application Fees are not refundable.
Study Deposits are intended to offset Dominion Energy’s cost of evaluating and interconnecting generation projects. Dominion Energy will track the costs associated with an individual project. After the project’s completion, Dominion Energy will reconcile the cost to the deposit(s) provided. Dominion Energy will refund any over-collected amounts. If the costs exceed the deposit(s), the Interconnecting Customer will be invoiced for the remaining balance.
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