From the SRP website.

2021 All-Source Request for Proposals

SRP has issued a Request for Proposals (RFP) for resources to satisfy up to 1,000 MW of customers’ peak summer demand. SRP is seeking up to 400 MW of peaking resources by summer 2024 and up to 1,000 MW total by summer 2026. 

How to participate:

Please complete the registration form below by Nov. 30, 2021, to receive additional information on the RFP. Registration enables access to all RFP-related documents and allows receipt of messages and notices from SRP.

The 2021 All-Source RFP process uses Ariba, a web-based platform for hosting solicitations. After the deadline, SRP will send an email to all participants with instructions and a link to access Ariba. Please ensure that all individuals at your firm who will need access to the RFP documents are registered.

For more details, please see this All-Source RFP pdf document.