EDAM Parallel Operations Are Wrapping Up and Implementation is Imminent
ISO Market Edge by Hartigen | Volume 6
CAISO’s Extended Day-Ahead Market (EDAM) is completing one of its most critical phases: parallel operations, with the industry now rapidly approaching the May 1, 2026 go-live target.
Market participants across the West are actively running EDAM and DAME processes alongside existing day-ahead workflows, validating bids, schedules, and settlement outcomes in real-world conditions. This phase is designed to surface issues early and ensure operational readiness before full market launch. It also provides a unique opportunity to compare legacy DAM outcomes with EDAM results, helping organizations understand how pricing, congestion, and dispatch decisions may shift under the new market structure.
Go/No-Go Decision: What to Watch
CAISO is expected to make a final go/no-go decision in the coming weeks, based on:
Market simulation performance
Participant readiness and onboarding completion
Settlement validation accuracy
System stability during parallel operations
“This decision will determine whether EDAM and DAME move forward as planned on May 1 or require additional time. ”
For participants, this milestone is critical. It not only signals operational readiness across the market, but also confirms whether internal systems, processes, and teams are fully prepared to transition from testing into live financial exposure.
Activation Plan: What to Watch
CAISO is expected to release a full activation plan in the coming days, including:
SC requirements
A full timeline for activation of each CAISO system
This plan will be critical for understanding the participants required activities prior to, during and after the go-live date.
Quick Recap: What’s Changing with DAME & EDAM
Over the past year, CAISO has introduced major structural changes to the day-ahead market:
EDAM expands day-ahead optimization beyond California, enabling coordinated scheduling across multiple balancing authorities
DAME adds new products like imbalance reserve and reliability capacity to better manage uncertainty and reliability between day-ahead and real-time markets
Enhanced price formation and congestion management improves transparency and regional efficiency
Increased renewable integration through broader geographic optimization
Together, these changes mark a shift toward a more regional, coordinated Western power market. This evolution is designed to improve economic efficiency and reliability, but it also introduces new complexities in bidding strategy, settlement calculations, and operational coordination across a larger footprint.
What This Means for Market Participants
As parallel operations complete, organizations should be focused on:
Validating bid-to-settlement workflows
Ensuring system integration and data flows are stable
Identifying gaps in allocation, reporting, and downstream billing
Preparing teams for new market timelines and operational cadence
The next week is critical. This is the final opportunity to resolve issues before full production exposure. Participants should also be analyzing differences between DAME/EDAM and current DAM outcomes to refine strategies and ensure they are positioned to respond effectively to new pricing dynamics and regional interactions.
Hartigen Perspective
At Hartigen, we’re working closely with clients to navigate parallel operations and prepare for go-live. Through PowerOptix® enhancements, we’re helping teams:
Automate settlement validation and allocation workflows
Adapt to new DAME/EDAM product structures
Reduce manual effort during high-volume market transitions
In addition, we’re supporting clients with deeper visibility into settlement impacts and customized allocation logic, ensuring that downstream billing and financial reporting remain accurate as market complexity increases.
“These capabilities are especially important during parallel operations, where discrepancies can be identified and resolved before they impact live operations.”
Final Take: The transition to EDAM is Happening Now
With the go/no-go decision around the corner, readiness today directly impacts performance on day one. Organizations that take full advantage of this parallel operations window (testing systems, validating processes, and training teams) will be best positioned to operate confidently and competitively in the new EDAM environment.
Stay tuned for updates as CAISO moves closer to launch.
Past Editions
For past information regarding CAISO’s EDAM & DAME initiatives, visit our latest articles:
https://www.hartigen.com/blog/markets-vs-caiso-edam-key-differences
References
Content in this edition reflects Hartigen’s internal expertise, with significant contributions from our CAISO expert, Debra Andrews.