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How to Connect to Duke Energy's Grid

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.

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Application to Interconnect

Complete and return an application to interconnect.

Duke Energy Indiana Level 1 Application for Interconnection applies to installations 10 kW and under that use a UL 1741-compliant inverter.

Duke Energy Indiana Level 2-3 Application for Interconnection must be used if the installation exceeds 10 kW or is not inverter-based.

Electrical Diagram

An electrical one-line schematic diagram that depicts the project and the equipment to be installed should accompany the interconnection request. The one-line diagram should show all electrical equipment from Duke Energy’s metering location to the energy source including switches, fuses, breakers, panels, transformers, inverters, energy source, wire size, equipment ratings and transformer connections. For systems that are not inverter-based, control drawings and settings for protective relays must also be included.


Attach documentation, such as manufacturer’s specification sheets, showing that the inverter is certified by a nationally recognized testing laboratory to meet the requirements of UL 1741. If the system is not inverter-based or is not UL 1741 compliant, additional protection will be required.

Attach with the application documentation showing the equipment specification (product literature) information for the solar panels.

Site Drawing

Attach site drawing, sketch or description indicating location of the energy source, inverter and Duke Energy’s meter.

FERC Qualifying Facility Status

A generating facility proposing to sell electricity to Duke Energy Indiana under a Purchase Power Agreement on the Standard Contract Rider No. 50 – Parallel Operation – For Qualifying Facility Tariff 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 as defined by the FERC, Title 18 CFR Part 292.101.

Projects smaller than 1 MW (1,000 kW) are no longer required to file a 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 (1,000 kW) 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 Federal Energy Regulatory Commission’s website.

Please send a copy of the FERC QF Certificate filing to Duke Energy Indiana with the interconnection application if you are required to file Form 556.


Customer is expected to maintain sufficient amounts of insurance coverage against risks related to the generation facilities for which there is a reasonable likelihood of occurrence, as required by the 170 IAC 4-4.3.10. Customer shall agree to provide Company with proof of such insurance upon Company’s request.


If a Duke Energy inspection and witness test is required, Customer shall contact Duke Energy within three business days of completion of the generation facility installation to schedule an inspection and witness test, which will occur within 10 business days of completion of the generation facility installation, or as otherwise agreed to by Duke Energy. The customer may not operate the generation facility (except for operational testing not to exceed two hours) until such inspection and witness test is successfully completed and all other terms and conditions in the interconnection agreement have been met. If a Duke Energy inspection and witness test is waived, operation of the generation facility may begin when installation is complete, all terms and conditions in the interconnection agreement have been met and customer has received a confirmation letter from Duke Energy indicating that the project is complete.

Please mail the interconnection request package to: Duke Energy Carolinas, P.O. Box 1010, 400 South Tryon Street, Charlotte, NC 28201, Attention: Mail Code ST13A. If you have questions regarding the interconnection process or rate options, please contact us via email at, by calling 1-866-233-2290 or by fax at 980-373-5244.

Important Deadlines: If your goal is to complete a new solar photovoltaic, wind, or micro-hydro generation project by December 31, 2014, you must submit a complete interconnection request to Duke Energy no later than October 1, 2014. Project construction and any local/municipal inspections should be completed in time to permit Duke’s field inspection to be completed before November 3, 2014.