London Array will not go ahead with the second phase of an offshore wind farm, partly because of the time it would take to assess the impact on birds. The consortium behind the Thames Estuary development said there were "technical challenges and environmental uncertainties" surrounding the site.
London Array's wind farm is already the biggest of its kind in the world.
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The 24-year-old was unarmed and the incident is not being treated as terror-related.
Some platforms have been taken out of service with disruption expected to continue until the end of the day.
The Met Office has extended its weather warnings for snow and ice to cover vast swathes of the country, including London and the South East.