Electrice

“A subsea cable – which would be 1,000km long and sunk to depths of 1,000 metres – could meet 1.5% of UK electricity demand … [from] the highly reliable potential energy in Iceland’s hydro dams.” (http://www.theguardian.com/world/2013/oct/27/iceland-seeks-uk-funding-cable-project)

Provided the cable can be constructed so as not to be susceptible to the marine equivalent of geese flying into it.

Current

“Some small mammal species on forest islands, created by a hydroelectric reservoir, in Thailand became extinct in just five years.” (http://www.bbc.co.uk/news/science-environment-24229723)

Not because of being surrounded by water and electricity.