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Glossary - T

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
T&D Transmission and Distribution
TDSP Transmission and/or Distribution Service Provider
TDTWG Texas Data Transport Working Group
TEPPF Total ERCOT PhotoVoltaic Power Forecast
TEWPF Total ERCOT Wind Power Forecast
TIER Times/Interest Earning Ratio
TLF Transmission Loss Factor
TMTP Texas Market Test Plan
TOAP Temporary Outage Action Plan
TOU Time Of Use
TOUS Time Of Use Schedule
TPE Total Potential Exposure
TSP Transmission Service Provider
TTPT Texas Test Plan Team
TUO Total Usable Offset
TWC Texas Water Code
TX SET Texas Standard Electronic Transaction

Tangible Net Worth

Total shareholder’s equity less goodwill and other intangible assets.

Technical Advisory Committee A subcommittee in the ERCOT governance structure reporting to the Board of Directors as defined by the ERCOT bylaws.
Temporary Outage Action Plan (TOAP) A temporary set of pre-defined actions to execute post-contingency, during a specified Transmission Facility or Resource Outage, in order to address voltage issues or reduce overloading on one or more given, monitored Transmission Facilities to below their Emergency Rating with restoration of normal operating conditions within two hours. A TOAP must be implementable and may include transmission switching and/or Load shedding. TOAPs shall not be used to manage constraints in SCED by either activating them or deactivating them.
Texas Nodal Market Implementation Date The date on which ERCOT starts operation of the Texas Nodal Market in compliance with the rules and orders of the PUCT. Once this date is determined, ERCOT shall post it on the ERCOT website and maintain it on either the ERCOT website or the MIS Public Area.

Texas Standard Electronic Transaction (TX SET)

  1. Texas Standard Electronic Transactions (TX SETs) are the electronic data transactions, implementation guides, and applicable external standards that enable and facilitate the retail business processes in the deregulated Texas electric market.
  2. The procedures used to transmit information pertaining to the Customer Registration Database are set forth in Section 19, Texas Standard Electronic Transaction.
Three-Part Supply Offer An offer made by a QSE for a Generation Resource that it represents containing three components: a Startup Offer, a Minimum-Energy Offer, and an Energy Offer Curve.
Time of Use (TOU) Meter A programmable electronic device capable of measuring and recording electric energy in pre-specified time periods. For Load Profiling purposes TOU Metering does not include IDRs.
Time of Use Schedule (TOUS) A schedule identifying the Time of Use period associated with each Settlement Interval. These schedules may include on-peak, off-peak, and shoulder periods.
Transmission Access Service The use of a TSP’s Transmission Facilities for which the TSP is allowed to charge through tariff rates approved by the PUCT.
Transmission and/or Distribution Service Provider (TDSP) An Entity that is a TSP, a DSP or both, or an Entity that has been selected to own and operate Transmission Facilities and has a PUCT approved code of conduct in accordance with P.U.C. SUBST. R. 25.272, Code of Conduct for Electric Utilities and Their Affiliates.
Transmission and/or Distribution Service Provider (TSP) An Entity under the jurisdiction of the PUCT that owns or operates Transmission Facilities used for the transmission of electricity and provides Transmission Service in the ERCOT Transmission Grid.
Transmission Element A physical Transmission Facility that is either an Electrical Bus, line, transformer, generator, Load, breaker, switch, capacitor, reactor, phase shifter, or other similar device that is part of the ERCOT Transmission Grid and defined in the ERCOT Network Operations Model.
Transmission Facilities The following Facilities are deemed to be Transmission Facilities:
  1. Power lines, substations, and associated facilities, operated at 60 kV or above, including radial lines operated at or above 60 kV;
  2. Substation facilities on the high voltage side of the transformer, in a substation where power is transformed from a voltage higher than 60 kV to a voltage lower than 60 kV or is transformed from a voltage lower than 60 kV to a voltage higher than 60 kV; and
  3. The direct current interconnections between ERCOT and the Southwest Power Pool or Comision Federal de Electricidad (CFE).
Transmission Loss Factor (TLF) The fraction of ERCOT Load (forecast or actual) that is considered to constitute the ERCOT Transmission Grid losses in a Settlement Interval, based on a linear interpolation (or extrapolation) of the calculated losses in the off-peak and on-peak seasonal ERCOT base cases.

Transmission Losses

The difference between energy put into the ERCOT Transmission Grid and energy taken out of the ERCOT Transmission Grid.

Transmission Service The commercial use of Transmission Facilities.
Transmission Service Provider (TSP) An Entity under the jurisdiction of the PUCT that owns or operates Transmission Facilities used for the transmission of electricity and provides transmission service in the ERCOT Transmission Grid.
TSP and DSP Metered Entity Any Entity that meets the requirements of Section 10.2.2, TDSP Metered Entities.