Request for Bid (RFB) No. 26087

Nebraska Public Power District (DISTRICT) intends to procure all material, labor, services, supervision, construction equipment, transportation, tools, and such other items necessary to perform and complete a Rotor-Out Generator Inspection (ROGI) at the Hebron Combustion Turbine (CT) Power Generation Facility located on North Highway 81, Hebron, Nebraska.

The CONTRACTOR shall provide inspection reports to the DISTRICT with the CONTRACTOR’S recommended repairs. The CONTRACTOR shall be required to obtain the DISTRICT’S written approval prior to making the recommended repairs. The CONTRACTOR shall also be responsible for reassembly of the CT generator and rotor upon completion of the DISTRICT approved repairs.

The CONTRACTOR shall provide all material, labor, services, supervision, construction equipment, transportation, tools, and such other items necessary to perform and complete a Rotor-Out Generator Inspection (ROGI) at the Hebron Combustion Turbine (CT) Power Generation Facility near Hebron, Nebraska.

The CONTRACTOR shall provide inspection reports to the DISTRICT with the CONTRACTOR’S recommended repairs. The CONTRACTOR shall be required to obtain the DISTRICT’S written approval prior to making the recommended repairs. The CONTRACTOR shall also be responsible for reassembly of the CT generator and rotor upon completion of the DISTRICT approved repairs.

Scope of work – Electrical

• Polarity Index and Insulation Resistance testing of the main stator.
• Low resistance continuity testing of the stator windings.
• Polarity Index and Insulation Resistance testing of the main rotor field.
• Continuity testing of the rotor windings.
• Insulation Resistance testing of the brushless exciter stator and rotor windings.
• Electrical testing of all diode wheel fuses and diodes.
• Functional testing of rotor field ground detector system per OEM guidelines.

Scope of work – Mechanical

• Exciter shall be completely disassembled and all ducting removed.
• Upper end shield shall be removed and thoroughly inspected.
• Bearings shall be fully disassembled.
• Lower end shields shall be removed and thoroughly inspected.
• Inner air guides shall be removed and thoroughly inspected.
• The generator rotor shall be removed using OEM recommended tooling provided by the DISTRICT.

Scope of work – Stator Core

• The stator wedges shall be checked for tightness.
• A stator wedge tap test shall be conducted.
• The stator end-turns and blocking shall be checked.
• The stator vent spacers shall be mechanically inspected.

Scope of work – Rotor and Exciter

• The rotor wedges shall be checked for tightness.
• A rotor wedge tap test shall be conducted.
• A thorough inspection of the rotor end-turns.
• The main rotor studs shall be thoroughly inspected and tightened.
• The diode wheel shall be fully stripped and painted with insulating varnish and rebuilt in accordance with OEM specifications.

Scope of work – Reassembly

• The rotor shall be reinstalled with OEM best practices.
• The coupling shall be installed and inspected.
• A generator alignment shall be completed using a laser or optical alignment tool and the complete results shall be recorded along with any shims or adjustments required.

Start-Up Support

The CONTRACTOR shall provide one balance engineer for the following:

• Monitor and analyze vibration in support of start-up after combustion turbine is reassembled.
• Specialty service for up to three (3) days on-site after combustion turbine is reassembled.

Final Report

Within four weeks of the completion of the repair process, the CONTRACTOR shall issue a final report for each component set that shall contains a mapping of all defects, a description of work performed, and testing as applicable.

All bids shall be submitted via email to the DISTRICT at:

whruska@nppd.com

imzohne@nppd.com

The subject line of the email shall include the name of Bidder as well as this RFB Number, i.e., "[Bidder’s Name]’s Submittal for RFB No. 26087". The DISTRICT has a twenty (20) megabyte limit on emails.

Bids must remain valid for thirty (30) days from this date.

The DISTRICT expects to award this Contract on or before **November 19, 2026**.

The current tentatively scheduled dates for the CONTRACTOR to perform all site work are Spring 2027 Maintenance Outage: START: **March 22, 2027** END: **May 17, 2027**.

Under no circumstances shall work begin under this Contract by the CONTRACTOR until the CONTRACTOR has obtained all insurance coverage’s required under ATTACHMENT A, paragraph X, “Insurance”, and such insurance has been approved by the DISTRICT.

Invoices received by the DISTRICT will be paid no later than thirty (30) calendar days after receipt by the DISTRICT.