VIDEO: The energy can be stored in air-filled caves?

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Controversy energy project compressed air underwater cave

October 11, 2015 Last Updated at 07:30 BST

The search for new ways to produce energy often complicated and controversial - and in Northern Ireland is a project to compress air in the caves below the seabed, otherwise.

It is used with gas, to run when the wind does not blow turbine.

But some fear that the process could be harmful to the natural habitat, such as Andy Martin says.

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