In the report from the Offshore Valuation Group that by harnessing 20,000 offshore wind, wave and tidal devices would acheive this. There would be an export of surplus energy to the rest of the UK or Europe and 50,000 jobs created.
Of course such benefits need investment as much as £4bn a year just in Scotland.
Niall Stuart, chief executive of Scottish Renewables, said:
"There has never been a clearer and more dramatic picture of the scale of the renewable resources around our seas and coasts.
"Not only does this offer a huge potential cut in carbon emissions, this is the biggest single economic opportunity for Scotland in coming years."
We can with the combination of renewables on offer be a fully renewable powered nation with reliable supply by 2050, as the Liberal Democrat manifesto promised. It is reckoned that 11,400 giant offshore wind turbines, about 4,000 wave machines and 5,000 tidal generation devices would deliver this potential.