December 2012: 35percent.org is an useful blog focussed on sustainability issues related to the massive new development proposed at the Elephant and Castle (see earlier post on this).
The top link to the site sets out some current concerns over the energy proposals on the site, especially in relation to connecting the different energy centres on site (which would hep form a more efficient area-wide heat network), and also the likelihood of using biomethane gas (the proposal in the developers application is to use the Green Gas Certification Scheme to link the London scheme to a site which is injecting biomethane elsewhere in the national gas transmission grid). The blog entry states that no such injection schemes are currently operating, which was true at the time of writing (early November 2012) but, coincidentally, the Poundbury anaerobic digestion (AD) in Dorset began operation just over a week ago (see here and here) and is injecting renewable gas generated from the AD into the gas grid.