Bridge Watchkeeping eh?
I was in tongue biting mood and about to move on (thinking I might take The Register off my favourites since this article isn't the first with an obvious bias) when Mr Page chips in.
You may be an expert at watchkeeping bridges but I don't think you've got your head around renewables. In case you hadn't noticed, there's not going to be much option in the not too distant future (things like cold fusion nothwithstanding) so we'll have to get by with some pretty drastic energy conservation plans (probably 80-90%).
If you plan to keep fossil fuel generators I'd like to hear where you suggest their fuel's coming from.....Russia's about the only realistic future supply for our gas generators and they've just started sending long range bombers over to shake us up a bit. And the Mid East is going to be busy supplying the real world powers USA, China and India.
And claiming something is 'economically unflyable' says absolutely nothing about the subject, burning huge amounts of valuable hydrocarbons will certainly come to be viewed as economic madness.
And tides are not just water sloshing in and out, when ocean basins, the coriolis effect and planetary vorticity are factored in you get a tidal wave rotating around an amphidromic point which does give a large variation to tide times (especially in the north sea).