GREC Unit 2 to Unit 1 IPB Interconnection for Grand River Energy Center

Jan 28, 2026

Amendment 2 to Solicitation RFP 8634 U1 U2 ISO Phase changes the following

Q&A from 11 March 2026 10:00 AM CST to 19 March 2026 12:00 PM CST. ALL QUESTIONS MUST BE PROCESSED THROUGH BID EXPRESS. NONE WILL BE ACCEPTED THROUGH EMAIL, FAX, PHONE, OR TEXT SINCE THIS IS A SEALED BID PROCESS.

Bid Due date from 18 March 2026 8:00 AM CST to 1 Apr 2026 2:00 PM CST. ALL BIDS MUST BE PROCESSED THROUGH BID EXPRESS. NONE WILL BE ACCEPTED THROUGH EMAIL, FAX, PHONE, OR TEXT SINCE THIS IS A SEALED BID PROCESS.

You must register with Bid Express to view the RFP Packet. It costs $50.00 to upload a proposal.

No other changes at this time.

Amendment 1 to Solicitation RFP 8634 U1 U2 ISO Phase changes the following

A new Non-Mandatory Site Visit is being added for 5 March 2026 1:00 PM CST. LOCATION: Grand River Energy Center – TSE Building – 8142 Hwy 412B Chouteau, OK 74337. Please procced to check in at South Gate Entrance. Procurement Officer will meet attendees at the South Gate Entrance and

escort attendees to the TSE Building. Please wear appropriate PPE i.e. FR clothing, Safety Toe Shoes, Ear Protection, and Hard Hats. A Sign In Sheet will be provided and Required. Please respond that you will be or your company will be sending someone to attend.

Q&A from 10 February 2026 10:00 AM CST to 11 March 2026 12:00 PMCST. ALL QUESTIONS MUST BE PROCESSED THROUGH BID EXPRESS. NONE WILL BE ACCEPTED THROUGH EMAIL, FAX, PHONE, OR TEXT SINCE THIS IS A SEALED BID PROCESS.

Bid Due date from 16 February 2026 8:00 AM CST to 18 March 2026 2:00 PM CST. ALL BIDS MUST BE PROCESSED THROUGH BID EXPRESS. NONE WILL BE ACCEPTED THROUGH EMAIL, FAX, PHONE, OR TEXT SINCE THIS IS A SEALED BID PROCESS.

You must register with Bid Express to view the RFP Packet. It costs $50.00 to upload a proposal.

No other changes at this time.

Amendment 1 to Solicitation RFP 8634

The Bid Submission Deadline is February 16, 2026 at 8:00am Central Time.

The Question Submission Deadline is February 10, 2026 at 10:00am Central Time.

Please visit https://www.bidexpress.com to view the solicitation documents, ask questions and submit a bid.

Bid Opening will take place on the Bid Express website. There will NOT be a Public Opening.

***PLEASE NOTE***

There will be a Non-Mandatory Pre-Bid Meeting/Site Visit on Thursday, February 5, 2026, 12:00pm Central Time—LOCATION: Grand River Energy Center – TSE Building – 8142 Hwy 412B Chouteau, OK 74337. Please procced to check in at South Gate Entrance. Procurement Officer will meet attendees at the South Gate Entrance and escort attendees to the TSE Building. Please wear appropriate PPE i.e. FR clothing, Safety Toe Shoes, Ear Protection, and Hard Hats. A Sign In Sheet will be provided and Required.

Questions can be submitted within the RFP at the Bid Express website until February 10, 2026 at 10:00am Central Time. Questions will NOT be answered via phone, mail, fax, or email.

This is a Sealed Bid Process. All Quotes/Proposals MUST be submitted through Bid Express. Go to https://www.bidexpress.com and look for either GRDA or Grand River Dam Authority Solicitations and RFP 8634. You MUST be registered with Bid Express to view the RFP. There is a $50.00 fee to upload your Quote/Proposal. NO Bids/Proposals will be accepted via Phone, Mail, Fax, or Email