SCG draft report on 2022 Common Case assumptions - Western ...

Glossary
AC: Alternating Current - A type of electrical current, the direction of which is reversed a regular
intervals or cycles in the U.S. the standard is 120 reversals or 60 cycles per second.
ATC: Available Transfer Capacity - A measure of the transfer capability remaining in the physical
transmission network for further commercial activity over and above already committed uses. It is
defined as Total Transfer Capability less existing transmission commitments (including retail customer
service), less a Capacity Benefit Margin, less a Transmission Reliability Margin.
BA: Balancing Authority - The responsible entity that integrates resource plans ahead of time, maintains
load-interchange-generation balance within a Balancing Authority Area, and supports Interconnection
frequency in real time.
Balancing Authority Area - The collection of generation, transmission, and loads within the metered
boundaries of the Balancing Authority. The Balancing Authority maintains load-resource balance within
this area.
CC: Combined Cycle - A power plant that uses two thermodynamic cycles to achieve higher overall
system efficiency.
Conditional Congestion - Congestion that is contingent on a specific future.
Congestion - A condition that exists when transmission system constraints prevent the dispatch of
lowest cost resources to meet system loads.
Contingency - An event that changes the configuration of the electric power system, such as the loss of a
generator or transmission line.
CT: Combustion Turbine - A turbine that generates power from the combustion of a fuel.
DC: Direct Current - A type of electricity transmission and distribution by which electricity flows in one
direction through the conductor; usually relatively low voltage and high current.
DOE: U.S. Department of Energy - The federal agency designed “to advance the national, economic, and
energy security of the United States; to promote scientific and technological innovation in support of
that mission; and to ensure the environmental cleanup of the national nuclear weapons complex.”
DSM: Demand-Side Management - The term for all activities or programs undertaken by Load-Serving
Entity or its customers to influence the amount or timing of electricity they use.
DWG: Data Work Group - The DWG collects and verifies data used in the TEPPC database for economic
studies of transmission planning. This data is made available to SPGs, developers, regulators, and others.
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