Energy Efficiency is the only option available to us.

no wind, solar, hydro or geothermal?

Wind, solar (thermal solar), hydro and geothermal are all highly efficient as far as I know, with high eroei.

But its a very good comment - I should have said energy efficiency in energy production and energy consumption is the only option available - in co-generation I was describing an energy production system that may run on coal (for base load) topped up with urban waste and biomass.