IREM S.p.a.
Leader in the field of energy and lighting management, IREM offers a wide range of products for voltage stabilisation, electric isolation, luminous flux regulation and production of green energy.
http://www.irem.it/

Hydroelectric Research and Technical Services Group
Responsible for providing technical support, testing, and diagnostic services for hydroelectric power plants. Describes these areas of activity and provides online technical manuals and other publications.
http://www.usbr.gov/pmts/hydroelectric/

Power Matters - Hydroelectric Power
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http://www.tva.gov/power/hydro.htm

Farab
Turnkey contractor of hydroelectric power plants and equipment supplier established in 1992 as an affiliate to the Islamic Republic of Iran's Ministry of Energy. Site is in English and Farsi.
http://www.farab.com

From Energies International
Contact information, project photos and descriptions from this Spanish company specialized in the construction and operating of hydroelectric power plants and selling the energy produced to the national backbone grids in different countries of the world / Datos de contacto y descripción, acompañada de fotografías, de los proyectos realizados por esta compañía Española especializada en la construcción y explotación de centrales hidroeléctricas, y posterior venta de la energía producida.
http://www.fromenergies.com

Utilities Instrumentation Service
Instrumentation for electric power plants. Dam controls, water towers, waste water systems, hydroelectric, switchgear, and generators. Certifications, product lines, and client list.
http://www.uiscorp.com/

Phoenix Power Control, Inc.
Designs and supplies electrical and control equipment for hydroelectric stations, offering standardized designs for typical plant requirements, and specialized designs for large plants and unique site conditions.
http://www.phoenixcontrol.com/

Independent Power Corporation
Design, engineer and install solar, wind and hydroelectric power generation systems .
http://www.independentpowercorp.com

Power & Water Systems Consultants Ltd
PWSC provides mathematical modelling of water resources and hydro-thermal power generation systems, simulation and optimization, operational studies & system expansion.
http://www.pwsc.co.uk

Graph
Shows system power ratings versus discharge time at rated power for several technologies. Includes several batteries, flywheels, Compressed Air Energy Storage, and pumped hydroelectric.
http://www.electricitystorage.org/pix/photo_ESAratings.gif