UK and Irish ministers will today sign an agreement that could see some of the world's largest wind turbines built across the Irish midlands.
Stretching more than 600 feet (180 metres) in the air, the towers are set to generate energy for millions of UK homes from 2017.
The companies involved say the Irish power is a cheaper form of renewable than UK offshore wind.
But environmentalists have described the scheme as "crazy".
They say it risks damaging Ireland's landscape.
Under the plan, a number of companies are seeking to erect hundreds of wind turbines across the boggy midlands of Ireland. The power generated would be transferred to the UK via undersea cables that would join the grid at two points in Wales.