CAISO’s EDAM and DAME go live on May 1, 2026. Learn what’s changing, how utilities will be affected, and how your team can get ready for this major market evolution.
CAISO’s Extended Day-Ahead Market (EDAM) and Day-Ahead Market Enhancements (DAME) initiatives will fundamentally reshape how western utilities bid, settle, and operate. With the introduction of new products, more than 100 charge code updates, and continuous rule changes, the impact will extend far beyond a one-time implementation.
At a high level, extending the benefits of the established WEIM (Western Energy Imbalance Market) into the day-ahead timeframe, the Extended Day-Ahead Market EDAM expands CAISO’s day-ahead market to a broader western geographical footprint enabling entities outside of California to share resources, capacity and transmission more efficiently to improve reliability, optimize resource use, and provide economic benefits.
While participation in EDAM is voluntary, CAISO’s Day-Ahead Market Enhancements (DAME) will impact every CAISO participant. DAME enhances the core market design for all CAISO participants, introducing new operational products and improvements to scheduling, capacity procurement, and price formation.
Together, these initiatives create new opportunities—but also require utilities to rethink how they operate. In this blog, we break down what’s changing, how it will impact market participants, and what your team should do now to prepare.
EDAM and DAME will introduce a number of market structure, operational, and data changes that will impact utilities.
EDAM will introduce changes to how congestion revenue is allocated and how participants use intertie and transmission service request (TSR) scheduling.
New Imbalance Reserves (IR) and Reliability Capacity (RC) products through CAISO’s DAME will impact bidding and scheduling, optimization and market awards, and the final settlement process. Additionally, calculations around marginal energy costs will also change with the elimination of the system-wide component—with EDAM, calculations will shift at the balancing authority area (BAA) level.
CAISO’s EDAM and DAME will introduce several new data points to support the initiatives. Additionally, more than 50 new reports have been added to provide information about items including renewable forecasts, IR products, and pricing.
There are also new and updated settlement rules and charge codes. Altogether, 134 charge codes have been updated on the settlement site, and more than 25 new charge codes have been added to support EDAM activity and the new IR/RC products with DAME.
Most teams are underestimating the operational effort required—not just to go live with EDAM and DAME but to stay aligned as the market evolves. Utilities should take steps to avoid common implementation pitfalls, outlined below.
Ensuring system readiness is critical ahead of these market changes. Install software updates and verify that your data inputs, mappings, and market feeds are accurate and consistent across teams. Data quality is crucial as settlement complexity increases—small input mismatches can create outsized downstream errors in both bidding and settlement outcomes.
It’s essential to align early with trading, operations, and back-office teams on new products, charge codes, and reporting requirements.
You’ll need to update bidding strategies, incorporate accurate forecasting tools, test scenarios to optimize your portfolio, and be ready for submissions and scheduling for the May 1 go-live. Software updates are necessary to prepare the systems in advance to submit and receive data required for settlement processing and validation. Financial outcomes of trading and operations will reflect in the initial settlement statement published nine business days after the trade date.
CAISO has stressed the importance of setting up and submitting test submissions in the market simulation environment in the weeks leading up to the go-live date. This will help ensure a smooth rollout on May 1.
If you have existing custom processes or reports in your workflows, review and update them as necessary to accommodate new market parameters. With these initiatives, data volumes will be significantly higher, so it’s critical that you assess whether your current infrastructure is adequate or needs to be upgraded.
The introduction of IR/RC products expands bidding opportunities, but it also introduces new complexity. Evaluate whether to reserve capacity for these products while accounting for bidding obligations, performance risk, and offer caps. Success will depend on aligning strategy, risk management, and operations to effectively integrate these products into the portfolio.
Enhance your shadow and pre-settlement processes to reflect new EDAM/DAME charge codes and settlement structures. Ensure systems can generate true shadow values for these new charge codes, and update allocation logic to break down entity-level settlements by resource. As these frameworks evolve after go-live, plan to continuously refine shadow capabilities to keep pace with settlement changes and support confident bidding and risk management decisions.
May 1 is not the finish line. CAISO EDAM participants should expect frequent revisions well past the go-live date. To date, a total of 134 charge codes and pre-calculations have been either newly introduced or enhanced to support this initiative. Over the 15-month implementation and market trial period, more than 250 revisions and incremental updates were made to the Business Practice Manuals (BPMs), which establish the mandatory rules, calculation methodologies, and procedures governing the operation, planning, and settlement of the CAISO energy markets.
Additionally, Yes Energy anticipates further iterations of the methodologies behind Congestion Revenue Allocation (CRA) and new DAME product settlement calculations.
While the goal is to have everything correct by the go-live date, testing and revisions will continue after May 1. Interpretations will change, and new scenarios will be uncovered. We expect to continue our collaboration with CAISO and market participants as the market evolves.
Yes Energy has been building toward May 1 alongside our customers. First, we’ve updated several modules in PowerCoreTM, our bid-to-bill solution, to:
Our PowerCore visual analytics and report creation functionalities have been updated to reflect new products and data points, with export to Excel and CSV available out of the box.
On the Yes Energy market data side, pre-existing and new data series will flow into the products and reports. New price nodes and transmission outages data for CAISO EDAM/DAME will be integrated into our module map interfaces. Refer to the release notes and the FAQ page for the latest information (Yes Energy login required).
Our Customer Success and Professional Services teams are also available to help update your custom workflows, layouts, and reports in advance of the go-live date.
We maintain weekly collaboration with CAISO to address open issues and CIDI tickets, and we've built an EDAM/DAME resource hub for customers navigating the transition.
Utilities that treat EDAM and DAME as a one-time implementation will struggle to realize their full value. These frameworks require utilities to continuously iterate processes and refine data to adapt to evolving market conditions and regulatory expectations. Those who invest in system readiness, validation workflows, and adaptable processes will be well-positioned to operate with confidence as the market evolves.
Yes Energy brings deep experience supporting CAISO Market Redesign and Technology Upgrade (MRTU) and Western Energy Imbalance Market (WEIM) participants and is actively leading bid-to-bill EDAM implementations with utilities such as PacifiCorp (May go-live) and Portland General Electric (October go-live). These real-world implementations provide direct insight into how teams are preparing, where complexity shows up, and what it takes to operate successfully as the market transitions.
To learn how you can stay ahead of the coming market complexity, watch this on-demand webinar. We walk through real implementation lessons, common pitfalls, and what it takes to stay ahead of EDAM and DAME complexity.
You can also watch our on-demand webinar, “What EDAM and DAME Mean for CAISO: Market Changes and Data Impacts, diving further into how EDAM and DAME will impact the way you analyze and interact with market data in Yes Energy.