Acronym

Definition

Aggregator

Third party managing aggregations of DER systems located at customer facilities. The aggregator may own the DER systems or may only operate the DER systems

Area EPS

An EPS that serves Local EPSs

CHP

Combined Heat and Power

CIS

Customer Information System. System with customer information, including personal information, billing information, customer load profile information, etc.

DC EPS

A Local EPS that operates direct current

DER
DML

Distributed Energy Resource. A distributed set of one or more energy service resources, including generators, energy storage, controllable load, and ancillary services
Daytime Minimum Load. In Hawaii daytime minimum load is from 9am to 5pm on the distribution substation. DML is used as metric to determine how much DER is allowed on a particular substation

DER Operator

Responsible party for operational aspects of the facilities and their DER systems (generation, storage, and controllable load)

DER Owner

Responsible party for market and financial decisions  and contracts related to the facilities and their DER systems (generation, storage, and controllable load)

DERMS

DER Energy Management System. System that manages the settings and dispatch of DER systems

ECP

Electrical Connection Point. Point of electrical connection between the DER source or sink of energy and any EPS.
Each DER unit has an ECP connecting it to its local power system; groups of DER units have an ECP where they interconnect to the power system at a specific site or plant; a group of DER units plus local loads have an ECP where they are interconnected to the utility power system.
NOTE For those ECPs between a utility EPS and a plant or site EPS, this point is identical to the point of common coupling (PCC) in the IEEE 1547 “Standard for Interconnecting Distributed Resources with Electric Power Systems”.

Energy Storage

DER unit that includes the capability to store energy in any form which can eventually be converted to electrical energy

EPS

Electric Power System. Facilities that deliver electric power to a load

EV

Electric Vehicle. Automobile which is powered completely or in part by electricity and whose battery can be charged from an EPS

FDEMS

Facility Energy Management System. System that manages the settings and dispatch of DER systems within a facility. This facility could be a residence, a building, a commercial site, an industrial site, or any other generic location.

FDEMS

Facility DER Management System

GIS

Geographic Information System. Geographic model of the distribution system, including the location and characteristics of all distribution equipment and DER systems (individually and/or in aggregate)

ICT

Information and Communication Technology

IEC

International Electrotechnical Commission

IEEE

The Institute of Electrical and Electronics Engineers

ISO

Independent System Operator

L/HFRT

Low and High Frequency Ride-Through

L/HVRT

Low and High Voltage Ride-Through

Local EPS

An EPS contained entirely within a single premises or
group of premises

Microgrid

A group of interconnected loads and distributed energy resources with defined electrical boundaries that acts as a single controllable entity and is able to operate in both grid-connected or island mode.

Microgrid EPS

A Local EPS that can operate as an island and is operated as a virtual resource to the Area EPS

PCC

Point of Common Coupling. The point where a Local EPS is connected to an Area EPS.

PURPA

Public Utility Regulatory Policies Act

REC

Renewable Energy Certificates

REP

Retail Energy Provider. Third party managing DER systems based on market information.

RPS

Renewable Portfolio Standard.

RTO

Regional Transmission Operator

SCADA

Supervisory Control and Data Acquisition. Systems used by utilities for centralized monitoring and control of substation and other field equipment

UL

Underwriters Laboratory