My contribution to renewable energy discussion (Chris Davies MEP) on LibDem Voice:-
Why does no-one mention hydroelectricity these days? Look at the success
of Kielder Reservoir – and it also provides leisure facilities and a
soulution to drought. According to US Dept of Energy figures, (Wikipedia
– cost of energy by sources), average dollars per M/Wh, hydro costs
89.9, onshore wind 96.8, offshore wind 330.6(!) solar 156.9 and biomass
120.2. Wave power is estimated at 611(!!). So hydro really is the way to
go, for renewable energy. Regretfully, critics who aren’t interested in
pollution problems would point out that most conventional power sources
are cheaper than this, particularly gas.
It was suggested that (a) Hydro was not the best resource for Britain, space wise/availability of water with a sufficient fall in gradient, and (b) hydro in the Amazon was associated with significant methane outgassing.
My reply:-
The amount of decaying vegetation generating gases in a biomass generator like the Amazon Basin is far in excess of somewhere like Scotland – and even the writer acknowledges the results are far less consequence in colder climates.
Methane would be produced by rotting vegetation whether it fell into the water or not – soil and agriculture produce about half of the world’s methane, and one of the biggest sources is rice fields.
http://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/b_fdi_57-58/010025232.pdf
There have been proposals for extracting the methane dams generate .
http://news.bbc.co.uk/2/hi/science/nature/6638705.stm
There seems to be an assumption that all hydroelectric power needs big dams – certainly they’re useful, but homes near water can have a waterwheel to generate electricity just as easily as having their own wind turbine.
http://www.off-grid.net/2010/11/19/power-a-house-using-a-waterwheel/
There’s a great page on the pro/con debate for hydroelectricity on
http://debatepedia.idebate.org/en/index.php/Debate:_Hydroelectric_dams
Yes I know I'm obsessed with Hydro, but we need lots of different renewable energy sources to mitigate the end of fossil fuel pollutants. More investment in infrastructure! Now please!