One thing we have plenty of is Rain water / Sewage Water / Rivers and streams
When you think about the peek demand for Power is also the peek demand for water / waste water
Advert brake/show/match ended on TV people go into the kitchen Fill the kettle and switch it on then go use the toilet then flush.
Now if you retro fit a few Archimedes Screw Generators
http://www.youtube.com/watch?v=hFCBe0SvUWM
http://www.youtube.com/watch?v=MYrIN5KEuIk
to the Sewage system you can both make use of Sewage Tide's to generate the surplus needed for all them kettles Plus also control the tides so there bit more tamed for the sewage plant to mange the waste
When the kettles are done the remain surplus can go into cryo of gases for long term storage
Sewage has more than one way to be useful
You can make Organic Bactria battery's where as the Bactria brake down the waste into other chemicals (ones that can be used as a battery different electrolyte's ) DC AC Inverters can make this low voltage useful and the Bactria gas generated can be stored and power a gas engines or cryo stored
You also have the Solid waste that can be used a Fuel / fertilizer You can even make use of the Bactria in the solids to still make power
Archimedes Screw Generators can also be Put on rivers and streams
You can also blend them in with the natural surroundings as if they weren't even their
They aslo keep water on the land for longer so more water will make it into water tables plus also stop flooding due you can now control the water flows into rivers
Archimedes Screw Generators also don't hurt fish so a big help to sea fish stocks due you have more ponds to breed them in
There also self clearing to any jam and it will auto chew it up