Western Energy Imbalance Market (WEIM)

Western United States; British Columbia. Status: operational.

Wholesale design: Voluntary real-time wholesale energy market enabling participating balancing authorities to buy and sell imbalance energy while CAISO manages congestion and dispatch optimization.

Market type
Regional market overlay
Operator
California Independent System Operator
Dispatch model
Security-constrained real-time economic dispatch across participating balancing-authority areas.
Pricing granularity
locational marginal pricing in CAISO's real-time market; the cited milestone release does not establish a settlement-interval value
Nominal frequency
60 Hz
Where energy trades

Where does energy trade in Western Energy Imbalance Market (WEIM)?

Energy in Western Energy Imbalance Market (WEIM) trades in 3 layers: real-time energy, imbalance energy and congestion management.

Revenue routes

Merchant revenue routes

  • real-time energy
  • imbalance energy
Caveats

Technical notes

Regional trading overlay; it does not replace each participant's balancing authority or resource-adequacy framework.

Where this comes from

Official sources

Market explainer

Current as of · from the Global Electricity Market Catalogue v1.2.0 (compiled to , CC BY 4.0). Facts belong to the linked official authorities; verify the current rules before design or bidding decisions.

Questions

Common questions about Western Energy Imbalance Market (WEIM)

Who operates Western Energy Imbalance Market (WEIM)?
California Independent System Operator operates Western Energy Imbalance Market (WEIM), covering Western United States and British Columbia.
How is energy traded, priced and settled in Western Energy Imbalance Market (WEIM)?
Western Energy Imbalance Market (WEIM): Voluntary real-time wholesale energy market enabling participating balancing authorities to buy and sell imbalance energy while CAISO manages congestion and dispatch optimization. dispatch — Security-constrained real-time economic dispatch across participating balancing-authority areas; pricing granularity — locational marginal pricing in CAISO's real-time market; the cited milestone release does not establish a settlement-interval value.
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