If it's really 2015 we're stuffed no matter what happens...
If blackouts are on the cards by 2015, no amount of pro-fracking hype is going to help as its mid-2014 now and it'll take a good few years to:
a) get permissions for exploratory wells in geologically suitable areas,
b) drill exploratory wells,
c) get sample data and analyse it,
d) if viable economically, attempt to get permissions and agreements for production wells,
e) if successful in d) build out infrastructure to support production wells (eg pipelines, distribution facilities, waste handling, etc),
f) drill production well sequence and start fracking.
Of course the extreme unconventional energy field a lot more than just fracking... you've also got Underground Coal Gasification and Coal Bed Methane proposals, all competing for time, resources and dwindling fossil fuel investment now that some big players are starting to divest from coal, oil and gas investments. We've dicked about so long over nuclear that its not going to have the first new reactor online until 2023 (just about ready to power HS2 in 2026!) and renewable build outs are constrained by cash, political power plays and the physics of low power densities.
Energy efficiency measures could have helped but again we've not been moving quickly enough on those as a nation. I think we'll probably find that those "accelerate" come the blackouts.