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Glossary - V

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
VAR Volt-Ampere reactive
VDI Verbal Dispatch Instruction
VEE Validation, Editing and Estimation of meter data
VSS Voltage Support Service
Verbal Dispatch Instruction (VDI) A Dispatch Instruction issued orally.

Voltage Profile

The set of normally desired Voltage Set Points for those Generation Resources specified in paragraph (2) of Section 3.15, Voltage Support, in the ERCOT System.

Voltage Set Point

The voltage that a Generation Resource is required to maintain at its Point of Interconnection (POI) and that is initially communicated via the Voltage Profile but may be modified by a Real-Time instruction from ERCOT, the interconnecting Transmission Service Provider (TSP), or that TSP’s agent.

Voltage Support Service (VSS) An Ancillary Service that is required to maintain transmission and distribution voltages on the ERCOT Transmission Grid within acceptable limits.