Reporters Jillian Ambrose and Damian Carrington discussed their story on oil firms’ profits amid the war in Iran and the climate crisis and answered your related questions
PCMcGarry asks: Given the facts that we live on a collection of islands and that tides are predictable, what serious efforts have been made to harness sea power and with what success?
Damian:
The UK is actually home to the world’s most powerful tidal stream turbine, operated by Orbital Marine Power, off Orkney and, the company says now moving into commercial deployment. But the device produces 2MW of power, the same as a small wind turbine. So there is a huge scale up needed to make a difference, and putting electric equipment in moving salty water is tough.
There are big tidal plants in France, South Korea and China, but a large tidal lagoon project for Swansea a decade ago was cancelled by ministers in 2018 who said it was too expensive compared with alternatives such as offshore wind farms and nuclear power.
The climate crisis is causing winter rainfall in the UK to increase, as the Met Office states:
“The winter half-year (October to March) for the most recent decade, 2016–2025, has been 3% wetter than 1991–2020, and 13% wetter than 1961–1990.”
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