Search
January 31, 2026

SPP Western Energy Imbalance Service (WEIS)

COVID, Storms, Wildfires Roiled Markets in 2020
COVID-19 and record hurricane and wildfire seasons made 2020 “a unique and at times challenging year,” FERC said in its State of the Markets report.
WEIS Market ‘First Step’ to Full RTO Membership
Utilities are hoping their participation in SPP's WEIS market will be the "first step" to full RTO membership.
SPP Successfully Launches Western Market
SPP successfully launched its WEIS market, making it the first RTO with power markets in both the Western and Eastern Interconnections.
Texas Utility Plans to Join CAISO EIM
El Paso Electric, a utility that serves more than 400,000 customers in Texas and New Mexico, plans to join CAISO’s Western Energy Imbalance Market in 2023.
UPDATED: Stakeholders Approve WEIS Market Launch
Stakeholders in SPP’s Western Imbalance Service market unanimously approved its Feb. 1 launch, the last major milestone in a project that began in 2019.
2020 a Year of Challenges for SPP, Sugg
Last year SPP's Board of Directors appointed Barbara Sugg as CEO, and she wasted little time implementing her vision for the RTO.
FERC Approves SPP’s Western Market Tariff
FERC handed SPP an early Christmas present when it approved the RTO’s second version of a tariff for its five-minute WEIS market.
SPP Stakeholders Dig into WEIS Market Study
SPP offered stakeholders a deep dive into an analysis of the RTO’s Western regional market that projects millions in savings for members.
SPP WEIS Stakeholders OK Final Test
SPP’s WEIS stakeholders voted to move forward with parallel operations, the final test before the WEIS market’s planned February launch.
CREPC-WIRAB
Industry Leaders Talk Diversity in the West
A discussion on diversity in the energy industry, hosted by CREPC-WIRAB, delved into resource adequacy and the potential for a Western RTO.

Want more? Advanced Search