Local Generation Glossary

Electric Power System

Facilities that deliver electric power to a load. An area electric power system is a service area typically maintained by the local energy company, which is responsible for its design, construction, operation, and maintenance.

Generator-Owner

An applicant to operate on-site power generation equipment in parallel with the energy grid.

Induction Generator

An electric generator that supplies alternating current. These generators draw excitation current from the power system, and cannot be configured for stand-alone service.

Inverter

A machine, device, or system that changes direct current power to alternating current power. Inverters that are self-commutating can be configured for stand-alone service. Inverters that are line-commutated cannot be configured for stand-alone service.

Isolation Device

A readily accessible, lockable, visible-break switch located between the local generation facility and its connection to the local energy company.

Load Area

An electrical distribution area, radial or network, that is supplied by a particular area substation.

Local Generation (DG)

A generally small (up to 20 MW) electric production facility that is dedicated to the support of a nearby associated load.

Network (or Energy Grid Network)

A large (neighborhood size) energy grid, supplied by high-tension feeders through network transformers and maintained at 120/208 volts, to which the majority of customers are connected.

Network Protector

A switching device (usually associated with a network transformer) with the ability to trip or close automatically based on conditions of power flow.

Network Transformer

A device for supplying power to a low voltage network from high-tension feeders. Each network transformer is associated with a network protector that trips to prevent the flow of power from returning to the high-tension feeder.

Synchronous Generator

An electric generator that provides alternating current. These generators can be configured for stand-alone operation. However, their contribution of fault current without fault current mitigation has an impact on the energy company’s operations, and must be evaluated prior to acceptance on our system.

Standardized Interconnection Requirements

A document issued by the NY State Public Service Commission and located on their website under Local Generation Information. The document sets forth the application process, technical interconnection requirement and Con Edison’s interconnection policies and practices.

Transformer

A device used to match the voltage of a distributed generator with that of the connecting energy company. It may also provide some measure of electrical isolation during a fault event.

Verification Test

A test performed upon initial installation and repeated periodically to determine that there is continued acceptable performance.