page_title: SeaGen
section_title: Environmental impact
hierarchical_section_title: SeaGen / Environmental impact
caption_attribution_description: English: Map of Stranford Lough showing location of SeaGen tidal generator
context_page_description: SeaGen was the world's first large scale commercial tidal stream generator. It was four times more powerful than any other tidal stream generator in the world at the time of installation. It was successfully decommissioned by SIMEC Atlantis Energy Limited in summer 2019, having exported 11.6GWh to the grid since 2008.
  The first SeaGen generator was installed in Strangford Narrows between Strangford and Portaferry in Northern Ireland. Strangford Lough was also the site of the very first known tide mill in the world, the Nendrum Monastery mill where remains dating from 787 have been excavated.
context_section_description: SeaGen has been licensed to operate over a period of 5 years, during which there will be a comprehensive environmental monitoring programme to determine the precise impact on the marine environment.
caption: 1,800,000 m3 (400 million imp gal) of water flow in and out of Strangford Lough twice a day.
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