QA – Solar Design and Construction Services

Environmental Protection Agency’s Clean Port Program

BIDS & PROPOSALS

Response: AC.

Questions 2 - Is there also a DC kW target we are looking for?

We are not directly charging the equipment, we are offsetting. Ultimately it will depend on the efficiency of the equipment selected by the contractor to meet the 316 AC kW output specification. Using parameters from the NREL database to estimate DC output potential range between 1.2–1.3%, which is typical for modern prismatic solar panels. Please note that these estimates are at the panel level. Using an assumed DC/AC ratio of about 1.25 and a 316 kW AC array, the estimated DC capacity would be approximately 395 kWDC. Specific DC output would be calculated by the contractor if needed for their design.

Question 3 - Is there a date when the solar array will be powered up?

Response: We didn’t put a required date, but per the grant we have until December of 2028 to get it up and
running, but we are hoping to have it done in one year. The schedule at this point is negotiable.

Question 4 - Will we be given more information on the usage of the EVs at the site?

Response: The size of the array is based on what we put into our application to the EPA. The overall demand is
large, but it fluctuates throughout the day and night.

Question 5 - This array will be a behind-the-meter situation with DTE? Everything will go to the grid?

Response: That is correct, no batteries will be used.

Question 6 - Is there a setback requirement for building near the well in the field? Is there a certain distance the build needs to be away from the well?

Response: Assume the minimum per zoning requirements, and additional information will be given during the design process.

Question 7 - Can you please clarify the BABA compliant requirement?

Response: We would like for the system to be BABA compliant. Please include a BABA compliant option for the
system to the extent practicable. Current information regarding BABA compliant solar systems is
available at Build America, Buy America (BABA)-Compliant Solar Manufactured Products | Department of
Energy. If a BABA compliant system is not feasible, please include a bid that includes pricing that includes
receiving a BABA waiver. It is suggested that both BABA and non-BABA compliant pricing be provided in
proposal if possible.

Question 8 - Regarding subsurface contamination, are driven posts and boring (both deeper than 12") allowed? The RFP states, "Any disturbance to this barrier must be mitigated by replacement," so we want to ensure we account for any deviance from our typical ground mount approach.

Response: We would recommend that mitigation would be planned for excavation deeper than 6 inches.

Question 9 - Are the "Robust soil management protocols, health and safety measures, and stormwater controls"; referring to during construction, or afterwards?

Response: This text refers to soil management protocols, health and safety measures, and stormwater controls
needed during construction.

Question 10 - Will this project be sales tax exempt?

Response: Yes.

Question 11 - Is a ground mounted ballasted system acceptable in lieu of post driven? See attached for reference.

The RFP does not prescribe specific design methods. We are open to considering different design approaches, including ballasted systems, provided all applicable codes and requirements are met. The final design will be reviewed with the selected contractor.

Question 12 - Where is the preferred tie-in location for the PV system? Interior at the main switch board or exterior at the utility gear.

For cost estimating, assume an interior tie-in at the main switchboard. Final tie-in location will be confirmed during design.

Question 13 - Has the soil been tested or capped under the existing driveway between the field and the building? Excavation/direction boring is required to get power from the PV modules to the building.

Please assume that a soil management plan would be needed and this area is capped. This will need to be verified during the design process.

Question 14 - From the RFP: “However, secondary power sources must be incorporated to ensure consistent energy availability during periods of low solar generation.” Can you please elaborate on this sentence? What expectations are there for a secondary power source?

This means the solar array will not serve as the primary power supply. The system is intended to offset EV equipment electrical demand, not to directly power that equipment.

Question 15 - I know this was asked during on the site visit, but please confirm that this project does not require battery storage.

Correct. Battery storage is not part of this scope. The array is not intended to directly charge EV
equipment.

Question 16 - Given the requirements below, from the RFP, will this project require strictly union labor? • Perform all work under a Project Agreement with the Michigan Building and Construction Trades Council (MBCTC). • Require all contractors of any tier to execute a Letter of Assent to the Project Agreement prior to starting work.

No. Union labor is not strictly required, provided all contractors can meet the requirements of the Project Agreement and execute a Letter of Assent.

Question 17 - Are you able to send a recent electric bill (all pages, front and back) for the facility, not only to confirm usage but also to check rate details to accurately model savings projections.

Please see attached.

Electric Bill Sample Download

Bids & Proposals