Mainstream Appraisals
26 Maple Road
P.O. Box 947
North Hampton, NH 03862
(603) 964-7113
Fax: (603) 964-4077

Member American Society of Appraisers.

A B O U T   M A I N S T R E A M

hydro electric dam

Mainstream Associates was founded in 1983 as a consulting firm specializing in the acquisition, development, and regulatory compliance of small scale, independent power production facilities.

Starting in 1986, Mainstream turned its attention to the valuation of independent power generating assets including hydropower and cogeneration facilities. Our early appraisals were prepared in compliance with the Financial Institutions Reform and Recovery Act of 1987 (FIRREA) primarily to determine the security value of powerplant assets for financing or refinancing purposes. Since then we have prepared over 150 appraisals of electric generating assets in thirteen different states and in Costa Rica.

electrical transmission towers

In recent years, Mainstream Associate's appraisal work has increasingly focused on ad valorem tax assessment. As electric industry restructuring goes forward, we expect this aspect of our work to increase. Generating assets that are divested from ownership by electric utilities will undoubtedly change in value as they move from cost of service regulation to market driven pricing. Not only is it important for buyers and sellers to understand these changing valuations, but new powerplant owners need to keep their property tax expenses under control in order to maintain market share in an increasingly competitive environment. Likewise, taxing authorities must stay current on the fair market value of power plants not only to optimize property tax income but also to maintain the viability of resident generating facilities. In short, the functional unbundling of the electric industry will have revolutionary property tax impacts involving the valuations of all aspects of the electric industry - generation, transmission, and distribution alike.

While our traditional core services have been in the appraisal and valuation of hydroelectric stations, Mainstream Associates has experience appraising a variety of electric power assets, including electric utility transmission lines, substations, and distribution systems; nuclear power plants; natural gas fired combustion turbines and cogereration systems; oil burning thermal electric generating facilities; and wood burning power plants.


Recent ad valorem tax appraisal assignments have included:

Asset Description Owner Client
Mystic Substation 13.8/24/115/345 kV NStar/Boston Edison Everett, MA
Caribou Generation Station 23 MW Steam/Oil Fuel 7 MW Diesel 0.9 MW Hydro WPS Development Inc. City of Caribou, ME & WPS
Greenville Steam Station 17.275 MW/Wood Fuel Greenville Steam Co. Greenville Steam Co. & Town of Greenville, ME
Lowell Cogeneration Station 24.2 MW Natural Gas Topping Cycle Cogen. Martin Realty Trust City of Lowell, MA
Bear Swamp Pumped Storage Facility 600 MW Pump Turbines USGenerating Co. Town of Florida, MA
Millwood Substation 13.8/115/345 kV Consolidated Edison Chappaqua, NY
Trenton Hydroelectric Station 22,5000 KW Hydro electric Station Niagara Mohawk Power Corporation Trenton Falls, NY
Transmission/Distribution, Substations, Switching 7 - 115 kV, 5 - 34.5 kV lines, 115 kV switching station, 2 - 34.5/115kv substations, distribution systems, and land corridors Niagara Mohawk Power Corporation Village of Brockport & Town of Sweden, NY
Seabrook Nuclear Powerplant 1242 MW Pressurized Boiler Reactor Nuclear Powerplant North Atlantic Energy Corporation State of New Hampshire Department of Revenue Administration
6 Hydroelectric Stations on the Connecticut River Moore (140 MW)
Comerford (140 MW)
McIndoes (10.6 MW)

Wilder (35.6 MW)
Bellows Falls (49 MW)
Vernon (22.4 MW)
USGenerating Company State of New Hampshire Department of Revenue Administration


In addition to the list of assignments noted above, Mainstream Associates has also appraised hydroelectric stations and dams in the following locations:
Vermont
Wells River
Hyde Park
Killington
Newbury
Brockways Mills
    (Rockingham)
Ottauqueechee
    (N. Hartland)
Moretown #8
Ladds Mill
    (Worcester)
Martinsville
St. Johnsbury
Mississquoi Hydro
    (Sheldon Springs)
Barnet
Springfield
Northfield
North Troy
Winnooski

Massachusetts
South Barre
Webster
Dudley
Winchendon(2)

New Hampshire
Littleton
Wilton
Durham
    (proposed)
Dover (2)
Sunapee
Lebanon (2)
Woodsville
Milton
East Rochester
Errol
Claremont (3)
Marlborough
Nashua
    (Mines Falls)
Greenville (3)
Pontood
Ahsuelot (2)
Campton
Bristol
    (Newfound Hydro)
Lisbon
Berlin (3)
Gorham (2)
Shelburne
Maine
Kennebago
Saco
North Berwick
Lewiston
Falmouth

Connecticut
Derby/Shelton
Jewett City
    (Wyre Wynd)

New York
Rio
Whitehall
Trenton
Potsdam (2)

Michigan
Cheboygan County
Midland County
Gladwin County

We have also appraised hydroelectric sites in
California, Nevada, Virginia (2), Washington, Montana, Illinois, and Costa Rica.



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Mainstream Associates
26 Maple Road -- P.O. Box 947
North Hampton, NH 03862
(603) 964-7113 -- Fax: (603) 964-4077
Email: glagassa@mainstreamappraisals.com

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