OpenHydro Group Ltd. is an Irish energy technology company whose business is the design and manufacture of marine turbines for generating renewable energy from tidal streams. The company’s vision is to deploy arrays of tidal turbines under the world's oceans, silently and invisibly generating electricity at no cost to the environment.

OpenHydro’s technology is one of the first to reach the development stage of permanent deployment at sea. In May 2008 the company connected its EMEC research structure to the electricity distribution network and became the first company in the UK to generate tidal stream power onto the National Grid. In 2008 OpenHydro deployed its first subsea unit at EMEC using OpenHydro’s custom built heavy lift barge, the OpenHydro Installer. Using this methodology, a difficult and lengthy project of many months was transformed into a quick, cost-efficient and repeatable operation

Future turbines will be installed using this approach which will allow turbines to be situated directly on the seabed with no part of the structure visible above the surface and deep enough so as not to pose a hazard to shipping. In November 2009 OpenHydro deployed its first 1MW, commercial scale turbine in the Bay of Fundy, Canada in a project developed in partnership with Nova Scotia Power.

OpenHydro is currently developing projects in Europe with the French utility, EDF off the Brittany coast and in Alderney in the Channel Islands, as well as another project in North America, in the Puget Sound, Washington State with the Snohomish County Public Utility District.

In 2009 OpenHydro was awarded the Engineer’s Ireland Innovative Company Award, as well as the Irish Times Leadership Group Renewable Energy Award and the Company Pioneer Award at Energy Ocean 2009.