SPP's Energy & Market Web Service Update: What You Should Know
Key Takeaways:
SPP is transitioning its Energy and Energy Notify Web Services from V22 to V24, and its Market and Market Notify Web Services from V17 to V19.
MTE (Member Test Environment) activation began 8/6/2026 and PROD activation follows 9/15/2026, with the current V22/V17 versions retiring 11/16/2026.
Now is the time to inventory internal systems touching these web services and reserve testing capacity for the MTE, which opened 8/6/2026 — waiting until the retirement deadline (11/16/2026) risks a compressed timeline.
About the SPP Energy V24 & Market V19 Web Service Update
Southwest Power Pool (SPP) is rolling out an Energy and Market web services update across two foundational service families used throughout its market footprint. The Energy and Energy Notify Web Services are moving from Version 22 to Version 24, and the Market and Market Notify Web Services are moving from Version 17 to Version 19. These services carry the data exchanges market participants rely on for energy and market operations, so this web service version transition has the potential to affect any integration built against them.
Why it Matters
Version transitions on core web services touch more than a version number. Schema changes, modified API fields, and updated response formats can ripple into any process built on top of the Energy or Market web services. Organizations that wait until the retirement deadline to act risk compressed testing windows and unplanned engineering work.
Getting ahead of V24/V19 now gives integration teams time to inventory dependencies, plan testing capacity around the MTE and avoid a scramble as the 11/16/2026 retirement date approaches.
What’s Driving the Change
SPP periodically revises its Energy and Market web services to reflect evolving market rules and system capabilities across the Integrated Marketplace. SPP is implementing a CHILLS transmission service. CHILLS creates a structured, tariff-based path for large loads to interconnect and participate in the market using non-firm, conditional transmission service. The new version on web services also includes functionality needed to support Real Time Dispatchable Transactions (RTDT).
How to Prepare
Bookmark SPP’s Future Technical Specifications page and check it as V24/V19 details are published.
Watch for the MIPO release, it should be the first real source of impact detail, so treat current planning as directional until it publishes.
Inventory internal systems, integrations, and reports touching Energy/Energy Notify and Market/Market Notify web services.
Reserve testing capacity for the MTE, which opened 8/6/2026, ahead of the 9/15/2026 PROD cutover, and build in contingency time. Six weeks between PROD activation and the 11/16/2026 retirement is a reasonable validation window. If your organization depends on third-party or vendor integrations with these SPP services, confirm their V24/V19 readiness independently rather than assuming it.
Set an internal target to be fully migrated well before the 11/16/2026 retirement of V22/V17.
Hartigen’s Role
Market changes like this one are constant across ISO/RTO markets and staying ahead of them without disrupting your operations is exactly what PowerOptix is built to do. Rather than leaving customers to track, interpret, and implement every version update on their own, Hartigencontinuously monitors evolving market rules and builds the corresponding updates directly into the platform.
For the SPP Energy V24 and Market V19 transition, that means the necessary changes are already being incorporated into an upcoming PowerOptix release, so customers can stay current without taking on the technical burden themselves. It’s a core part of what sets PowerOptix apart — a platform designed to keep pace with the market, so your team doesn’t have to. Learn more, here.
Resources
For more information on the SPP Energy V24 & Market V19, please refer to:
Stay Ahead of Market Change
If you have questions about how this transition may affect your integrations, or want help planning your MTE testing timeline, reach out to your Hartigen representative.
References
Content in Volume 7 of the ISO Market Edge, reflects Hartigen’s internal expertise, with significant contributions from our SPP expert, Megan Hlavinka, and our director of product development, Rashmi Karnik.
