SPP’s RTO Expansion (RTOE) is scheduled to go live April 1, marking an important milestone for market participants across the SPP Integrated Marketplace (SPPIM).
As we approach go‑live, many participants are shifting their focus from long‑term planning to understanding what will change operationally, who is impacted, and how existing workflows will be affected once the market is live.
This update is intended to provide clarity ahead of April 1 and reinforce what market participants should be prepared for as RTO Expansion moves into production.
A reminder: RTO Expansion is a market initiative, not a new market
One important clarification ahead of go‑live: RTO Expansion is not a new market.
RTO Expansion is a market initiative within the existing SPP Integrated Marketplace, designed to extend SPP’s RTO operations westward and bring Eastern and Western participants into a single, unified market framework.
After April 1, there will be one SPP Integrated Marketplace operating across an expanded footprint. While new balancing authority areas support cost causation and settlement accuracy, it is no longer accurate to think of “SPPIM and RTOE” as separate or parallel markets.
What participants should expect at go‑live
April 1 represents the point at which RTO Expansion moves fully into live market operations. While much of the preparation has occurred behind the scenes, several changes will be visible to participants as the market goes live.
Market communications and APIs
As part of RTO Expansion, SPP has implemented updates to market communication APIs. These updates apply across the entire SPPIM footprint.
For PCI customers, these changes are handled directly within PCI’s platform. Existing workflows remain consistent, and participants do not need to take action to manage API transitions manually.
Settlement changes across SPPIM
The most significant impact for many participants will be reflected in settlements.
With RTO Expansion go‑live:
- New charge codes are being introduced
- Existing charge codes are being updated
- Settlement calculations are being adjusted to reflect the expanded footprint and updated balancing authority structure
Importantly, these settlement changes apply across the entire SPP Integrated Marketplace, not only to participants operating in the Western Interconnection.
How PCI supports customers through go‑live
As RTO Expansion approaches production, PCI supports customers by helping absorb market complexity and reduce operational disruption.
This includes:
- Implementing updated SPP market APIs within the platform
- Continuously reviewing SPP protocol changes throughout the RTO Expansion timeline
- Updating settlement calculations to align with the latest approved protocols before go‑live
This approach allows customers to focus on their operational and financial workflows while PCI manages underlying market changes.
Why clarity before April 1 matters
While preparation for RTO Expansion has been underway for several years, misconceptions still persist, particularly around whether RTO Expansion represents a new market or affects only Western participants.
Ahead of go‑live, it’s important to reinforce that:
- RTO Expansion is a market initiative within SPPIM, not a separate market
- The changes associated with RTO Expansion affect all SPPIM market participants
- Eastern and Western participants will operate within a single coordinated market structure once live
Clear expectations heading into April 1 help reduce confusion as participants begin reviewing live settlement statements and operational outcomes.
Looking ahead
As April 1 approaches, the focus shifts from preparation to readiness.
Following go‑live, participants can expect a period of validation and adjustment as they:
- Review settlement impacts
- Assess downstream workflow changes
- Fine‑tune processes within the expanded market structure
PCI will continue supporting customers as RTO Expansion transitions from launch readiness to live operations.
Want to learn more about how PCI supports customers operating in SPP RTO Expansion? Explore PCI’s software platform for SPP RTO participants and see how we help utilities navigate market changes with confidence.
