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Delaware Interconnection Standards

Date Last Updated11/16/2012
Policy TypeInterconnection Standard
State/FederalDE
Policy Administrator/Contact OfficeDelaware Energy Office
Policy Initiation Date1/19/2000
Policy SummaryDelaware law requires the Delaware Public Service Commission (PSC), Delaware Electric Cooperative (DEC), and municipal utilities to develop interconnection rules using the Interstate Renewable Energy Council's (IREC) model interconnection rules, and the U.S. Department of Energy's best practices for interconnection, as a guide.

Delmarva, Delaware's only investor-owned electric utility, has four levels of interconnection based on system size, system type (inverter-based or rotating), and fuel type (renewable or non-renewable) that apply to CHP. These categories determine the technical requirements and forms the customer must file. The four levels of review are as follows:
  • Level 1: applies to lab certified, inverter-based systems <10 kW. Utilities may not charge any processing fees to Level 1 applicants and liability insurance is not required.
  • Level 2: applies to lab certified or field inverter-based systems <2 MW that are connected to a radial distribution circuit or to a spot network serving one customer. Processing fees are limited to $50 plus $1/kW of capacity. Liability insurance of at least $2 million per occurrence and $4 million in aggregate is required for systems >1 MW.
  • Level 3: applies only to systems that will not export power to the grid and which do not require new infrastructure construction by the utility. Systems located on an area network must be inverter-based, use lab certified equipment, and be <50 kW. Systems located on a radial network must be <10 MW and not be served by a shared transformer. These systems are also subject to additional criteria dealing with the aggregate capacity of interconnected systems on a given network. Processing fees are limited to $100 plus $2/kW of capacity. Liability insurance of at least $2 million per occurrence and $4 million in aggregate is required for systems >1 MW.
  • Level 4: applies to systems <10 MW that cannot be approved or do not meet the criteria for review under a lower tier. Processing fees are limited to $100 plus $2/kW of capacity. Liability insurance of at least $2 million per occurrence and $4 million in aggregate is required for systems >1 MW.
An interconnection request may be eligible for expedited review if small generator facilities use lab certified equipment or field approved interconnection equipment. Lab certified equipment is defined as equipment tested and approved by a nationally recognized testing laboratory (NRTL) as being in accordance with IEEE 1547, UL 1741, and the National Electric Code (NEC). All systems must have a lockable external disconnect switch. The standards also contain provisions for dispute resolution, record retention and utility reporting requirements. The rules also provide timeframes for the utility to respond to each step of the application process.

Delaware Electric Cooperative's (DEC) interconnection guidelines are similar to Delmarva's. For renewable-energy generators <25 kW, systems must comply with all applicable safety and performance standards established by the NEC, IEEE and UL. These systems are also eligible for net metering. DEC customers with systems >25 kW are required to carry at least $1 million in liability insurance per occurrence and $1 million in property-loss insurance. Higher amounts of coverage may be required at the discretion of the DEC. An external disconnect switch is required for these larger systems.
CHP Eligibility RequirementsBoth fossil-fueled and renewably-fueled CHP systems are eligible for standardized interconnection.
Eligible Project Size (MW)Standardized interconnection applies to renewably fueled systems up to 10 MW, and non-renewable systems up to 1 MW.
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