121 Mount Vernon St., Boston, MA 02108, USA
Phone: +1617 242 2204 Fax: +1617 242 2205
SECTION 1
EXECUTIVE SUMMARY
Owner
City of Nashua, New Hampshire
Operator
Essex Power Services, Inc.
Essex Hydro, LLC
55 Union Street, 4™ Floor
Boston, MA 02108
Representatives
H. L. Turner Group, Inc.
John R. Lavigne, Jr.
JLavigne@hiturner.com
603/228-1122, ext. 149
1.1 Proposal Request
The City of Nashua, New Hampshire (“Owner”) is interested in replacing the turbine-generator-control system (“TGC”)
at its Jackson Mills Hydroelectric Project (“Jackson Mills HPP” or the “Project”)). Essex Power Services, Inc. (“EPSI”), as
operator of the project, has invited Mavel Americas, Inc. (“Mavel”) to submit a preliminary technical and cost proposal
(“Proposal”) for a TGC replacement. The Jackson Mills HPP, originally commissioned in 1984, is located at the Jackson
Falls Dam on the Nashua River.
The Project involves the removal of the existing 1000 kW single-regulated turbine and generator set and replacement
with a new double-regulated turbine and generator package. The upgrade Project will also include replacement of the
electrical balance of plant equipment. The design parameters for the site are operating head of 21 ft. and flow rate of
800 cfs.
The Technical Specification Package and Request for Preliminary Vendor Equipment Proposals (“Proposal Request”),
prepared by the H.L. Turner Group Inc. (“Engineer”) indicates an interest in a TGC arrangement with a similar inclined
turbine within the existing powerhouse. Alternative arrangements will be considered provided that impacts to the
existing structure and fish passage facility are minimized.
The plant is currently limited to 1000 kW output due to net metering rules. The Owner and EPSI are interested in
additional capacity with this upgrade even though the new unit may have to operate in a restricted mode until rule
changes are implemented.
Exterior view of the Jackson Mill Hydro Station
Project No. 0-29029.Rev.3 www.mavel.com Jackson Mills Upgrade
