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Glossary - G

For your convenience, this page contains an alphabetically organized list of terms, definitions and common acronyms used in the electric utility industry.

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Term/Acronym Definition
GADS Generation Availability Data System
GREDP Generation Resource Energy Deployment Performance
GSU Generator Step-Up
GTBD Generation To Be Dispatched
GTC Generic Transmission Constraint
GTL Generic Transmission Limit
Generation Entity The owner of an All-Inclusive Generation Resource and, unless otherwise specified in these Protocols, is registered as a Resource Entity.
Generation Resource A generator capable of providing energy or Ancillary Service to the ERCOT System and is registered with ERCOT as a Generation Resource. The term "Generation Resource" used by itself in these Protocols does not include a Non-Modeled Generator.

Generation To Be Dispatched (GTBD)

A dynamically calculated system total generation MW requirement used by Security-Constrained Economic Dispatch (SCED) for resource dispatch, calculated every four seconds.

Generic Transmission Constraint (GTC) A transmission constraint made up of one or more grouped Transmission Elements that is used to constrain flow between geographic areas of ERCOT for the purpose of managing stability, voltage, and other constraints that cannot otherwise be modeled directly in ERCOT’s powerflow and contingency analysis applications.
Generic Transmission Limit (GTL) The value of the transmission flow limit associated with a GTC.
Good Utility Practice Any of the practices, methods, and acts engaged in, or approved by, a significant portion of the electric utility industry during the relevant time period, or any of the practices, methods, and acts that, in the exercise of reasonable judgment in light of the facts known at the time the decision was made, could have been expected to accomplish the desired result at a reasonable cost consistent with good business practices, reliability, safety, and expedition. Good Utility Practice is not intended to be limited to the optimum practice, method, or act, to the exclusion of all others, but rather is intended to include acceptable practices, methods, and acts generally accepted in the region.
Governmental Authority Any federal, state, local, or municipal body having jurisdiction over a Market Participant or ERCOT. A Governmental Authority that is also a Market Participant may not exercise its jurisdiction in any matter that involves the interests of that Market Participant where that matter also involves the interests or responsibilities of any other Market Participant or ERCOT, unless the matter is one in which the Market Participant has exclusive jurisdiction.

Governor

The electronic, digital, or mechanical device that implements Primary Frequency Response of generating units/generating facilities or other system elements.

Governor Dead-Band The range of deviations of system frequency (+/-) that produces no Primary Frequency Response.