The power industry is changing fast — and that creates opportunities for new
participants to enter our competitive market. Be a scheduling coordinator, connect to
the grid, or bid into our markets.
WEIM is a wholesale energy trading market for the West. Our scalable and
flexible platform allows entities to join in a timeframe that works for their business.
EDAM will build on the economic, reliability, and environmental benefits of
the Western Energy Imbalance Market (WEIM) by optimizing the use of existing
transmission and resources in the much larger day-ahead timeframe across an expanded
footprint.
The ISO's RC West is the Reliability Coordinator (RC) of record for many
balancing authorities and transmission operators in the western United States. An RC
oversees grid compliance with federal and regional grid standards, and can determine
measures to prevent or mitigate system emergencies in day-ahead or real-time operations.
Confidential information and data communicated between the ISO and its
participants during the course of planning and market activities are protected through
robust systems and application security. All systems and applications, except OASIS,
require an User Access Administrator (UAA) to grant access and removal.
The ISO wholesale energy market is comprised of distinct day-ahead and
real-time processes. The energy products and services traded in our market allow us to
meet reliability needs and serve load. The market also offers services in which
qualified entities can buy and sell congestion revenue rights and engage in convergence
bidding activities.
The reliability requirements and resource adequacy programs provide
deliverability criteria that each load serving entity must meet, and provide rules for
counting resources that must be made available to the ISO. The ISO reliability
requirements program is intended to complement the state's efforts to implement resource
adequacy programs.
Join us for EDAM Congestion Revenue Allocation on May 11, 2026 from 1p.m.-5p.m. Topics will cover the phase 2 scope and objectives, potential design alternatives, and stakeholder engagement.
The California ISO will host a hybrid in-person/virtual RC West Summer Readiness Public Session on May 20, 2026 from 8:30 a.m. - 11 a.m. If you plan to attend the meeting in person, please register by end of day Friday, May 8, 2026.
The ISO manages the flow of electricity across high-voltage, long-distance power lines that make up 80 percent of California's and a small part of Nevada's grid. The nonprofit public benefit corporation also operates a competitive wholesale energy market, and conducts transmission planning to identify grid expansion needs.
