Bid Notice-C-10 Electrical Subcontractors - WQCF Solar Photovoltaic _ Battery Energy Storage System Project.pdf

CITY OF MANTECA _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

ENGINEERING DEPARTMENT

1001 W. CENTER ST. MANTECA, CA 95337 (209) 456-8460 FAX (209) 923-8956

We request bids from all qualified C-10 electrical subcontractors including but not limited to

DVBE/DBE/SDVOSB/SBE/MBE/VOSB/WBE’s for the following Project:

MANTECA FLOATING SOLAR AND BESS PROJECT, Manteca, CA

RFP Release Date: 10/20/26 @ 2:00 pm RFP Due Date: 11/9/2026 @ 2:00 pm

Contact: Nick Worley, NWorley@willdan.com

Scope of work includes:

The Project consists of the construction of a floating solar photovoltaic (FPV) generating system and a paired battery energy storage system (BESS) at the City of Manteca Wastewater Quality Control Facility (WQCF), delivered under a progressive design-build agreement consistent with California Government Code §4217.10 et seq. The FPV system is a

2.45 MWdc / 2.0 MWac array deployed on the southern secondary effluent storage pond, utilizing a high-density polyethylene (HDPE) float-based racking system (design basis: Ciel et Terre Hydrelio) with an anchoring and mooring system developed from site-specific bathymetric and geotechnical investigations. The array includes direct current (DC) collection, string inverters, and medium-voltage (MV) step-up equipment routed to the facility's existing electrical distribution system. The BESS consists of one (1) Qcells OmniSkid unit in the 4-hour configuration, providing approximately

1.25 MW / 4.99 MWh of integrated storage with power conversion, energy management and controls, and fire detection and safety provisions per applicable codes and listings.

At this time, Willdan is accepting Statements of Qualification from interested C-10 licensed electrical contractors.

Interested contractors should submit a Statement of Qualification to the contact listed above, including a current and active California C-10 license number, a summary of relevant experience with solar photovoltaic and battery energy storage system installations (floating solar experience preferred), key personnel, references, bonding capacity, and safety record (EMR). Willdan will review submittals and may invite qualified contractors to participate in the bid process.

Minimum Experience: Contractors must have successfully completed at least one photovoltaic installation of 2 MW or greater at a wastewater treatment facility that included integration of a battery energy storage system (BESS).

Basis of Award: The Progressive Design-Build Project will be awarded to the lowest, responsible, responsive, and most qualified firm, but not solely on lowest price. Willdan will evaluate and score each responsive bid on the following criteria:

project delivery approach and schedule, local support and presence, previous experience on comparable projects, product quality, price, and safety performance. Willdan reserves the right to reject any or all bids, to waive minor irregularities, and to award to the bidder whose proposal is determined to provide the best overall value to Willdan and the City of Manteca.

A Mandatory Bid Walk will take place 10/27/26 at 9:00am at 2450 W Yosemite Ave, Manteca, CA 95337.

Willdan Scope of Work: Construction Management, Design and Engineering, Material Procurement for Module, BESS, and Floating Solar Racking System, and Project Oversite.

CITY OF MANTECA _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

ENGINEERING DEPARTMENT

1001 W. CENTER ST. MANTECA, CA 95337 (209) 456-8460 FAX (209) 923-8956

C-10 Subcontractor Scope of Work: Installation of Willdan provided solar material including Panels, BESS, and Floating Solar (including anchoring and mooring). Commissioning and startup of the system. Operations and Maintenance of the system for 3 years -5 years

Subcontractors selected to participate in the bidding process will be issued a Request for Proposal (RFP) by Willdan and shall follow the RFP process set forth therein. Selected subcontractors must submit a complete bid package that includes all submittal information, forms, and documentation required by the RFP, by the date and in the manner specified.

Incomplete or non-conforming bids may be deemed non-responsive and rejected at Willdan's sole discretion.

Duration: Project duration is based on RFP scoring criteria. Anticipated installation duration is less than 5 months.

Disadvantaged Business Enterprise: DBE/DVBE/MBE/WBE/SBE participation is encouraged.

Documents are available to qualified contractors.