Dual_Circuit_Transmission_Line_Design_(Addendum_#3_Revision).pdf

REQUEST FOR INFORMATION (RFI) 2025-104

DUAL CIRCUIT TRANSMISSION LINE DESIGN

Gainesville Regional Utilities

301 SE 4th Avenue

Gainesville, FL 32601

1. REQUEST FOR INFORMATION

1.1. RFI PROCESS

The City of Gainesville d/b/a/ Gainesville Regional Utilities is requesting that any firm interested in participating in the RFI, respond by August 5, 2025 at 5:00 pm.

•This RFI process will not result in a recommendation of or selection of any supplier, or the issuance of a purchase order or agreement of any type.

•Confidential or proprietary information should not be included in the response.

•Suppliers are responsible for any and all expenses associated with responding to this RFI.

•Any procurement by GRU as a result of this RFI will be subject to a separate solicitation process and subject to budget approval.

All questions/inquiries related to this request should be directed to: Robbin Odowski Email:

odowskirr@gru.com

Information may be received up to but not later than 5:00 pm on Tuesday, August 5, 2025 via GRU e- Procurement Portal located at https://procurement.opengov.com/portal/GRU.

1.2. REQUIREMENTS

The following information, written clearly and succinctly, would be very helpful in terms of evaluating the feasibility and cost of this project.

• Provide a brief overview of your business and how long your firm has been in business (limit to one page).

• Provide a list of Utilities in Florida that you are currently doing business with (limit to Utility name only).

• Provide information on the services your company could provide in relation to the scope (limit to two pages).

• Indication that, based on the information provided in this request, your firm would be interested in submitting a State of Qualifications in response to a future solicitation.

• To the best of your ability, provide an estimated budget pricing for these services.

• DO NOT SEND A STATEMENT OF QUALIFICATIONS! THIS IS AN RFI ONLY. PLEASE SEND ONLY

THE INFORMATION THAT HAS BEEN REQUESTED.

Information may be received up to but not later than 9:54 am on Tuesday, August 5, 2025 via GRU e- Procurement Portal located at https://procurement.opengov.com/portal/GRU.

1.3. PUBLIC RECORDS

If Contractor is either a “contractor” as defined in Section 119.0701(1)(a), Florida Statutes, or an “agency” as defined in Section 119.011(2), Florida Statutes, Contractor shall:

1. Keep and maintain public records, as defined in Section 119.011(12) of the Florida Statutes, required by GRU to perform the service.

mailto:odowskirr@gru.com https://procurement.opengov.com/portal/GRU https://procurement.opengov.com/portal/GRU

Request For Information #REQUEST FOR INFORMATION (RFI) 2025-104 Title: Dual Circuit Transmission Line Design

2. Upon request from GRU’s custodian of public records, provide the public agency with a copy of the requested records or allow the records to be inspected or copied within a reasonable time at a cost that does not exceed the cost provided in this chapter or as otherwise provided by law.

3. Ensure that public records that are exempt or confidential and exempt from public records disclosure requirements are not disclosed except as authorized by law for the duration of the contract term and following completion of the contract if the contractor does not transfer the records to GRU.

4. Upon completion of the contract, transfer, at no cost, to GRU all public records in possession of the contractor or keep and maintain public records required by GRU to perform the service. If the contractor transfers all public records to GRU upon completion of the contract, the contractor shall destroy any duplicate public records that are exempt or confidential and exempt from public records disclosure requirements. If the contractor keeps and maintains public records upon completion of the contract, the contractor shall meet all applicable requirements for retaining public records. All records stored electronically must be provided to

GRU, upon request from GRU’s custodian of public records, in a format that is compatible with the information technology systems of GRU.

5. IF THE CONTRACTOR HAS QUESTIONS REGARDING THE APPLICATION OF CHAPTER 119,

FLORIDA STATUTES, AS TO THE CONTRACTOR’S DUTY TO PROVIDE PUBLIC RECORDS

RELATING TO THIS AGREEMENT, CONTACT THE GRU CUSTODIAN OF PUBLIC RECORDS

AT 352-393-1211, PUBLICRECORDSREQUEST@GRU.COM , PO BOX 147117, STATION

E3E, GAINESVILLE, FL 32614.

1.4. NO OBLIGATION TO CONTRACT

Release of this Request for Information, and any submittals of information do not in any way obligation Gainesville Regional Utilities to award a contract. This request is only for information to help GRU to determine how to move forward.

1.5. SCOPE

Archer - Parker transmission line:

To rebuild the existing 230kV, 795 ACSR transmission line to support dual 230kV circuits using 1590ACSR wire from Duke Energy Florida’s Archer Substation to GRU’s Parker Substation. The length of the 230 KV Transmission Line in question is 2.53 miles. Contractor is to design the new dual circuit pole line, specify transmission structures, materials, and provide a complete design package for construction, that includes but is not necessarily limited to Framing, Assembly, Foundation, Plan and Profile, and Station drawings, as well as Stringing Charts.

o New steel direct embedded transmission structure with pier foundations and grounding.

o Perform foundation, steel, and loading calcs.

▪ Fabrication drawings by steel vendor.

mailto:PublicRecordsRequest@GRU.com o Revise foundation, layout, and grounding details.

PROJECT EXECUTION

Jobsite Project Kickoff Meeting

A kickoff meeting will be held to introduce members of the project team and discuss the details of the project with GRU.

Demolition Design:

A demolition package shall be developed including drawings and sketches to indicate wiring, transmission poles, and other electrical devices to be removed.

The demolition drawings shall be used only for construction and shall not become permanent drawings.

The following drawings shall be included in the demolition design:

▪ One-Line Diagrams

▪ Layout & Section Cuts Drawings

▪ Plan View of transmission structures’ removal in stages

Layout and Controls Design:

Once the demolition drawings are completed, new installation drawings shall be developed in AutoCAD that reflect the addition of new equipment. The following drawings shall be included in the installation design:

▪ One-Line Diagrams

▪ Layout Drawings

▪ Section Cuts Drawings

▪ Foundation details

▪ Grounding details

▪ Circuit List

▪ Bill of Materials

A 30% Design Package will be submitted for review. GRU will have two (2) weeks to review and provide comments. The 30% Design Package will consist of the following:

• One-Line Diagrams

• Foundation Plan

• Electrical Layout

• Demolition Foundation Plan

• Demolition One-Line Diagram

• Demolition Layout Drawings

A 60% Design Package will be submitted for review. GRU will have two (2) weeks to review and provide comments. The 60% Design Packages will consist of the following:

• Section Cuts

• Demolition Section Cuts

• Conduit & Grounding Details

• Steel & Foundation Details

A 90% Design Package shall be issued to GRU electronically for review. GRU will have two (2) weeks to review and provide comments.

o Circuit/Conduit List o Bill of Material

After the drawings have been approved, one sealed electronic copy of the construction package shall be issued to GRU for reprography.

The final bill of material (BOM) may be used by GRU to procure material after the IFC Package is submitted.

After installation of the new equipment, any field modifications shall be incorporated into the design.

After approval of these modifications, one electronic copy of the drawings shall be issued to GRU.

PROJECT SCHEDULE.

Issue for Construction Package and other deliverables shall be provided according to the following table for the execution of this task assignment. As built drawings shall be provided within 4 weeks after installation and commissioning of the scope of work. Any delays to this schedule must have prior approval from GRU.

Milestone Activity Date

TBD TBD

On-Site Kickoff Meeting/Field Verification TBD

30% Design Review (via teleconference) TBD

60% Design Review (via teleconference) TBD

90% Design Review (via teleconference) TBD

Issue for Construction TBD

MEETINGS AND PROJECT MANAGEMENT

There will be the below planned meetings plus in-office construction support during project installation.

▪ Project Kickoff Meeting

▪ 30% design review meeting via teleconference

▪ 60% design review meeting via teleconference

▪ 90% design review meeting via teleconference

▪ One (1) site visit during the construction phase Construction will be performed and managed by GRU.

DELIVERABLES.

Respondent shall prepare and submit the below list of deliverables as part of the issue for construction (IFC) package:

▪ Provide Geotech report.

▪ Demolition Drawings

▪ Electrical Layout & Section Cut Drawings

▪ Grounding Layout/Detail

▪ Conduit Layout/Detail

▪ Foundation & Structural Drawings

▪ Conduit Schedule/Circuit Schedule

▪ BOM

Respondent shall prepare and submit the below list of deliverables as part of issue of the reports:

▪ Grounding Study

▪ Foundation, Steel, Conduit and Voltage Drop calculations

▪ Construction specifications

▪ Sag and tension profiles for each transmission line span

SPECIFIC GRU RESPONSIBILITIES.

▪ Provide existing substation design documentation.

▪ Review and approve deliverables within 2 weeks.

▪ Provide Fault Current and T-line shield wire information for Grounding Analysis

▪ Coordinate with Contractor.

BASIS OF COMPENSATION.

Total lump sum fees to complete the above work shall be negotiated via task assignments for milestone deliverables.

Payment Milestones:

• Project Award – 15%

• 30% Design Package Approval – 30%

• 60% Design Package Approval – 25%

• 90% Design Package Approval – 25%

• As-Built Submittal – 5%

• SPECIAL PROVISIONS.

Project Location(s):

Parker Road Substation

12301 SW Archer Road, Gainesville, FL 32618

Transmission Line Endpoint:

Archer Substation (owned by Duke Energy Florida)

Parcel ID 04631-001-00

Archer, FL 32618

Assumptions:

GRU is to provide Contractor with the PLS-Pole Property files for all poles being utilized in the design and analysis.

GRU is to provide Contractor with all proposed bill of material items prior to Contractor completing the bill of material, assembly drawings, framing drawings, modeling analysis, and any other material-dependent tasks.

1.6. Questions and Clarifications

Listed below are questions and clarifications to consider. When providing your estimated budget price, provide an explanation as to which route your estimated pricing is based on.

1. We have one existing 230KV transmission line with single conductor, 795 ACSR, which has an ampacity of 907 Amps (= 360.895 MVA @ 230 KV).

2. We are proposing a new dual circuit 230 KV transmission line, and each circuit should have the capacity to import 525 MVA (= 1,319 Amps at 230 KV).

3. From an economic standpoint, should we ask the Engineering Firms to consider the following:

a. For ease of operations and ease of maintenance, should we have two separate 230 KV transmission lines on different structures (aka two pole lines)?

b. If the existing structures can handle the additional load of larger conductors, it is more economical to use the existing structures for the first 230 KV line and build a second set of structures (2nd pole line) for the second 230 KV line? If yes, do we have enough width in our right of way (easement) to accommodate the second pole line?

c. If it more economical to build new structures with dual circuits on a single set of towers (one pole line with 2 circuits)?

d. Some SME advise that if the required conductor size on a 230 KV transmission line is larger than 1351 ACSS (for ampacity reasons), then it is better to use bundled conductor instead of single conductor for the following reasons:

i. Advantages of Bundled Conductors :

▪ Due to the increase in self-GMD reactance is reduced.

▪ We get a low voltage gradient at the surface of a conductor.

▪ Corona losses are reduced.

▪ Radio interference is reduced.

▪ Capacitance and loading capability are increased.

▪ Surge impedance loading becomes high.

▪ The reduced impedance of the bundled line will allow load to flow as intended.

ii. Disadvantages of Bundled Conductors :

▪ A large number of sub-conductors are needed to form a bundle of conductors. The cost of maintenance, replacement, and reliability increases.

▪ Due to increased cross-sectional area ice and wind loading increases.

▪ The construction of towers becomes complicated due to increased clearance requirements.

▪ The charging kVA of the line increases.

▪ As a number of sub-conductors are present in a group, damage to a single conductor destroys the entire group of conductors.

2. RESPONSE SUBMITTALS

The following information is required with the Response. Failure to provide the following information may be cause for the response to be deemed "non-responsive":

2.1. Response*

Upload your response per section 1.2 "Requirements".

*Response required