How to Connect to Duke Energy's Grid South Carolina
Duke Energy wants to ensure that your electrical generating equipment is interconnected with the power grid in a manner that's safe and reliable. The following steps will help as you prepare to generate your own electricity and interconnect to our grid.
An Interconnection Customer requesting a Pre-Application Form must submit Attachment 2 of the South Carolina Interconnection Procedures.
Complete and return an application to interconnect based on the size and type of generation.
To submit an interconnection request for inverter based projects up to 20 kilowatts in size, access and complete the Interconnection Request Online Application. To view a pdf of the Interconnection Request for projects up to 20 kW see Attachment 7 of the South Carolina Interconnection Procedures.
To submit an interconnection request for projects larger than 20 kilowatts or if the project is not inverter-based, use Attachment 3 of the South Carolina Interconnection Procedure.
The interconnection request must be signed by the customer requesting service.
A non-refundable processing fee should accompany the Interconnection Request. Checks should be made payable to Duke Energy Carolinas.
- For Generating Facilities up to 20 kW, the fee is $100.
- For Generating Facilities larger than 20 kW up to 100 kW, the fee is $250.
- For Generating Facilities larger than 100 kW up to 2 MW, the fee is $500.
Electrical One-line Diagram
Include an electrical one-line schematic diagram depicting the project and the equipment to be installed with Interconnection Request. The one-line diagram should include the project owner's name, project name, project address, and model numbers and nameplate sizes of equipment, including number and nameplate electrical size information for solar panels, inverters, wind turbines, disconnect switches, etc.
The diagram should also depict the metering arrangement required whether installed on the customer side of an existing meter ("net metering/billing") or directly connected to
the grid through a new delivery point requiring a separate meter. Include equipment specification (product literature) information for the solar panels and inverter(s) that
provide technical information and certification information of the equipment to be installed with the application.
The diagram should also depict the metering arrangement required whether installed on the customer side of an existing meter (net metering) or directly connected to the grid through a new delivery point requiring a separate meter. For drawings of recommended configurations depicting how a customer-owned generating facility should interconnect to the Duke Energy system for both Net-Metering and Purchased Power rates, please refer to these one-line diagrams. Please note that some diagrams are state-specific.
The National Electric Code and Duke Energy require the installation of a manual load-break AC disconnect switch or safety switch installed between the Utility System and the interconnection Customer’s equipment to be able to positively isolate the generation source from the grid when needed for emergency events, to perform maintenance, or assist in the restoration of service, etc. The switch must be able to provide a clear visible open point of disconnection, a clear visible indication of switch position, and have padlock provisions for locking the switch in the open position.
The switch must be installed on the Interconnection Customer’s side of the electrical interconnection with the Utility’s system, accessible to Utility personnel, and located in close proximity to the utility’s electrical delivery point. The switch must be labeled "Generator Disconnect Switch." The switch may isolate the Interconnection Customer and its associated load from the Utility’s System or disconnect only the Generator from the Utility’s System and shall be accessible to the Utility at all times.
FERC Qualifying Facility Status
A generating facility proposing to sell electricity to Duke Energy must be a "Qualifying Facility" as defined by the Public Utility Regulatory Policies Act of 1978 ("PURPA") and the Federal Energy Regulatory Commission ("FERC") regulations implementing PURPA. A "Qualifying Facility" is one that meets certain federal guidelines and qualifies to receive avoided cost payments from the utility. Depending on the project, a customer may need to fill out FERC Form 556, which is available on the FERC website.
Projects smaller than 1 MW (1,000 KW) are no longer required to file an FERC Form 556 to obtain QF status as long as they meet the QF requirements. To determine if you are exempt from the requirement to file a Form 556 for your facility, based on the small size of your facility, download the Form 556 from the FERC website and complete section 7. If the value you obtain in line 7g is less than or equal to 1,000 KW, then your facility is exempt from the Form 556 filing requirement.
Although facilities smaller than 1 MW are exempt from the requirement to file, there is no prohibition against filing the Form No. 556 application either for self-certification or Commission certification for these facilities.
Facilities larger than 1 MW (1,000kW) in size as defined by maximum net power production capacity must file a FERC Form No. 556 either as a self-certification (or self-recertification) or as an application for Commission certification.
Instructions for completing this simple, self-registration process with the FERC are found on the Duke Energy Web site under Obtaining FERC Qualifying Facility Status or directly on the Federal Energy Regulatory Commission's website located at www.ferc.gov.
Please send a copy of the FERC QF Certificate filing to Duke Energy Carolinas with the Application to Interconnect if you are required to file Form 556.
Customers are required to demonstrate liability insurance coverage maintained with an insurer authorized to do business in South Carolina. This should be submitted to Duke Energy with the Application to Interconnect.
Residential customers are required to demonstrate liability insurance coverage maintained with an insurer authorized to do business in South Carolina. The required coverage shall be a standard homeowner's insurance policy with liability coverage in the amount of at least $100,000 per occurrence.
Non-residential customers no larger than 250 kW are required to demonstrate liability insurance coverage maintained with an insurer authorized to do business in South Carolina. The required coverage shall be comprehensive general liability insurance with coverage in the amount of at least $300,000 per occurrence.
Non-residential customers larger than 250 kW are required to demonstrate liability insurance coverage maintained with an insurer authorized to do business in South Carolina. The required coverage shall be comprehensive general liability insurance with coverage in the amount of at least $1,000,000 per occurrence.
Purchased Power or Interconnection Agreement
If the project intends to sell its production to Duke Energy Carolinas on Rate Schedule PP(SC) Purchased Power, Duke Energy will prepare a Purchased Power Agreement based on the Application to Interconnect and mail to the customer for signature.
If the project intends to "net meter" using the Duke Energy Carolinas Rider RNM(SC) Net Metering, an Interconnection Agreement will be required. The Interconnection Agreement may be downloaded from the website, signed by the customer, and submitted with the initial interconnection request application. Duke Energy will sign and return a copy of the Interconnection Agreement to the customer.
After the project is installed it must be inspected by the local electrical inspector and by Duke Energy Carolinas before final interconnection acceptance can be granted. Please send a copy of the local electrical inspection approval document to Duke Energy Carolinas when the installation of the project is complete and has been inspected by the local electrical inspection authority.
Send all interconnection applications and correspondence to:
Duke Energy Carolinas
Attention: Customer Owned Generation - Mail Code ST13A
P.O. Box 1010
Charlotte, NC 28201
Overnight Mailing Address:
Duke Energy Carolinas
Attention: Customer Owned Generation - Mail Code ST13A
400 South Tryon Street Charlotte, NC 28202
The Duke Energy Carolinas interconnection queue posted below reflects the status of generators that have requested interconnection at distribution voltage levels with generation capacity greater than 20 kW. A list of the possible statuses and their definitions can be found here.
Important Deadlines: All interconnections are subject to completion of program and interconnection process requirements, Duke Energy Carolinas resource availability, holiday schedules, inclement weather, and other unforeseen system emergencies. If your goal is to complete a new solar photovoltaic, wind, or micro-hydro generation project by Dec. 31 of the current year, you must submit a complete interconnection request to Duke Energy no later than the dates listed below, depending on the size of the system.
|Size of distribution interconnected generation system intended to be operational by Dec. 31 of any year||Date by which Duke Energy Carolinas must receive a complete Interconnection Request||Date by which generation system receives electrical inspection approval (necessary to commission the system and set a meter)|
|20 kW and below||October 1||December 1||Above 20 kW||Evaluated on a case-by-case basis. Duke Energy Carolinas recommends allowing a minimum of six months to interconnect large generation projects|