Jim Donchess
Mayor e City of Nashua
December 29, 2020
Memo #21-COM3
To: Finance Committee
From: Mayor Jim Donchess
Re: Contract Amendment Jackson Mills Turbine, Generator & Controls Replacement
Change Order #1
In accordance with NRO: § 5-91 Amendment to contracts, this memo is to inform the Finance
Committee of a subsequent change to the Mavel Americas contract.
In preparation for the replacement of the turbine, generator and controls at Jackson Mills hydro, the
Mayor and Board of Aldermen passed R-19-142 on July 10, 2019 authorizing the issuance of bond
for improvements to both Mine Falls and Jackson Mills hydro projects. In partnership with HL Turner
Group, the Project Engineer, and Essex Power Services, the hydroelectric Operations and
Maintenance contractor, the City vetted and selected Mavel Americas from Boston, MA for the
manufacture of the turbine, generator and controls. The contract with Mavel Americas in the
amount of $1,271,700 was approved by the Finance Committee on April 15, 2020 and by the full
Board of Aldermen on April 28, 2020.
This Change Order No. 1 adds work to the contracted scope. The work includes adding (2) vibration
sensors to the generator and (6) vibration sensors to the gearbox, connecting all sensors to the
terminal box, and configuring all sensors in the control system. The vibration sensors signal minor
changes in the operation of the turbine, providing real time monitoring data to more accurately
diagnose a problem and react accordingly avoiding costly downtime.
This Change Order No. 1 increases the contract price by $5,800 from $1,271,700 to $1,277,500.
229 Main Street »* PO Box 2019 * Nashua, New Hampshire 03061-2019
603.589.3260 * fax 603.594.3450 * NashuaMayor@NashuaNH. gov
www.NashuaNH. gov
