The power of the wind and waves is ever-present in the Danish winter.
The Copenhagen climate change talks will discuss how to capture the energy from such "renewable" sources.
The UK plans to get 15% of all its energy that way within just 10 years.
Some experts believe it could provide for all our needs.
But the government's advisor is sceptical of just how far we can go.
More than just our homes
Professor David Mackay is the author of a book on sustainable energy.
He calculates that even if we covered every available plot, offshore location and tidal estuary with wind, wave and tidal power we may not meet all our current energy needs.
Total UK energy output is equivalent to 2.7 million GW/hours of electricity or 310 GW of capacity.
The market value of all energy consumed in the UK is £130bn ($216bn) a year with the amount spent on energy by final users at about £75bn.
Only about a third of the energy we use comes in the form of electricity.
Transport and heating are also key.
The wind doesn't always blow
Renewable energy is often unreliable.
They include wind, hydro-electric, tidal, solar and wave and geothermal power along with energy from plant and waste material - so-called biomass and bio-fuels.
The wind does not always blow so most wind-farms average 20-30% of their capacity.
The governments suggested 33 GW of offshore wind will generate just a third of that.
Tidal and hydroelectric power are more reliable, but hard to locate.
Professor Mackay estimates there are enough good spots for hydro-electric to provide 0.8% of our current energy needs.
Tidal power has just one commercial turbine in the Strangford Lough, Northern Ireland.
Carbon Trust research suggests the technology could provide 0.6% of current energy use.
But the numbers are rough.
"We're roughly where aviation was in 1920s," says Peter Fraenkel, technical director for the company behind the Strangford project, Marine Currents Turbines.
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