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 Losses Transmission Losses & Distribution Losses
TAC Technical Advisory Committee
TCR Transmission Congestion Right
TDSP Transmission and/or Distribution Service Provider
TLF Transmission Loss Factor
TSP Transmission Service Provider
TCR Interface The CSC for which Transmission Congestion Rights are auctioned and awarded.
TCR Invoice See Invoice
TDSP Metered Entity Any Entity that meets the requirements of Section 10.2.2, TDSP Metered Entities.
Technical Advisory Committee A subcommittee in the ERCOT governance structure reporting to the Board of Directors as defined by the ERCOT bylaws.
Texas SET Texas Standard Electronic Transaction procedures, set forth in Section 19, Texas SET, used to transmit information pertaining to the Customer Registration Database. Record and Data Element Definitions are provided in the data dictionary in Protocols Section 19.
Time of Use Metering A programmable electronic device capable of measuring and recording electric energy in pre-specified time periods. For Load Profiling purposes Time of Use Metering does not include IDRs.
Time of Use Schedule A schedule identifying the Time of Use period associated with each Settlement Interval. These schedules may include on-peak, off-peak, and shoulder periods.
Total Energy Obligation The total energy Obligation for a Qualified Scheduling Entity during a Settlement Interval, including the energy from the Balanced Schedule and integrated energy of instructed Ancillary Services.
Total Transmission Capacity The maximum power that may be transferred across a transmission corridor while maintaining reliability of the ERCOT System.
Transaction Clearinghouse A batch, transactional interface intended to provide reliable exchange of high volume, standardized transactions between Market Participants and ERCOT using the Texas SET procedures in Section 19, Texas SET.
Translation Factor The monthly ratio of the aggregate Competitive Retailer's four (4) coincident peak demand over the monthly aggregate Competitive Retailer's coincident peak demand, as further described in Section 9.8, Transmission Billing Determinant Calculation.
Transmission Access Service Use of the TDSP's Transmission Facilities for which the TDSP is allowed to charge for the use through tariff rates approved by the PUCT.
Transmission and/or Distribution Service Provider (TDSP) An Entity that owns or operates for compensation in this state equipment or Facilities to transmit and/or distribute electricity, and whose rates for Transmission Service, distribution service, or both is set by a Governmental Authority.
Transmission Billing Determinants Key parameters and formula components required by a TDSP in determining the billing charges for the use of its Transmission Facilities and/or distribution Facilities.
Transmission Congestion Right (TCR) A financial hedge against the cost of 1 MW flowing across a particular Commercially Significant Constraint, in a single direction, for 1 hour.
Transmission Facilities The following Facilities are deemed to be Transmission Facilities:
  1. Power lines, substation, and associated Facilities, operated at 60 kV or above, including radial lines operated at or above 60 kV.
  2. Substation Facilities on the high 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.
  3. The direct current interconnections with the Southwest Power Pool (SPP), Western System Coordinating Council (WSCC), Comision Federal de Electricidad, or other interconnections.
Transmission Loss Factors The fraction of ERCOT Load (forecast or actual) that is considered to constitute the ERCOT Transmission Grid losses in the Settlement Interval. Transmission Loss Factors are computed by ERCOT and are based on a linear interpolation (extrapolation) of the calculated losses in the off-peak and on-peak seasonal ERCOT base cases.
Transmission Losses Difference between energy input into the ERCOT Transmission Grid and the energy taken out of the ERCOT Transmission Grid.
Transmission Service Commercial use of Transmission Facilities.
True-Up Statement See Settlement Statement
Two-Day Ahead The 24-hour period beginning the instant after 2400 48 hours before the Operating Day.