How to Connect to Duke Energy's Grid North 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 who requests a Pre-Application Report must submit Attachment 3 of the North 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 or use Attachment 6 of the North Carolina Interconnection Procedures.
To submit an interconnection request for projects larger than 20 kilowatts or if the project is not inverter-based, use Attachment 2 of the North 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 the 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 for 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 (purchased power). For drawings of typical 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 Residential One-Line Diagram Examples and Non-Residential One-Line Diagram Examples.
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.
North Carolina Utilities Commission ("NCUC") Certificate of Public Convenience and Necessity
North Carolina state law requires that all sources of generation comply with the North Carolina Certificate of Public Convenience and Necessity process before construction on a project begins.
Renewable energy projects less than 2 MW in size are not required to obtain an actual "certificate;" however projects must file a Report of Proposed Construction ("ROPC") with the Commission and supply the information detailed in Commission Rule 8-65 before construction begins.
Information on this process can be found on the North Carolina Utilities Commission Web site under Commission Rule 8-64 and Rule 8-65.
Please send a copy of the NCUC report to Duke Energy Carolinas with the Interconnection Request.
North Carolina Utilities Commission ("NCUC") Registration Of New Renewable Energy Facilities
A retail customer planning to install a new renewable energy facility utilizing the Company’s net metering Rider NM(NC) not served on a time-of-use rate schedule must register their facility as a new Renewable Energy Facility with the NCUC under Rule R8-66 and assign the Renewable Energy Certificates produced by the facility to Duke Energy Carolinas using the North Carolina Renewable Energy Tracking System NCRETS. Information regarding NCUC Rule 8-66 can be found on the Commission website located at http://www.ncuc.net/ncrules/Chapter08.pdf.
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 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 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 Obtaining FERC Qualifying Facility Status can also be found at the Federal Energy Regulatory Commission's website located at www.ferc.gov.
Customers are required to demonstrate liability insurance coverage maintained with an insurer authorized to do business in North Carolina. This should be submitted to Duke Energy Carolinas with the Interconnection Request.
The required coverage for a residential customer shall be a standard homeowner's insurance policy with liability coverage in the amount of at least $100,000 per occurrence. The required coverage for a non-residential customer is comprehensive general liability insurance with coverage in the amount of at least $300,000 per occurrence.
Purchased Power Agreement
Contingent Approval to Interconnect
For Projects that use Attachment 6, Duke Energy will return a copy of the Interconnection Request granting contingent approval to install the facility. Please note that interconnection of the Generating Facility will be approved contingent upon the Terms and Conditions for Interconnecting a Certified Inverter-Based Generating Facility No Larger than 20 kW of the North Carolina Interconnection Standard.
Certificate of Completion and Inspection
Attachment 6 of the NC Interconnection Standard includes a Certificate of Completion form to be returned to Duke Energy when the project installation is complete and has been inspected by the local electrical inspection authority. Submission of this document signifies that the project is ready for Duke Energy's final inspection. Please include a copy of the local electrical inspection approval document with the Certificate of Completion.
If the interconnection request was submitted using Attachment 2, there is no separate completion document to submit. However, 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.
Submission of any remaining documents and Duke Energy’s field inspection is required before final approval can be granted.
Send all 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.
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|