low-carbon heat cost-competitive CCS energy demand regional growth CO2-EOR Joint Industry Project SCCS CCS competition Delivering CCS Cost Reduction Industrial CCS CCS Strategy energy intensive industries CCS Clusters North Sea CCS Costs COP21 CCUS fifth carbon budget infrastructure industrial strategy Phase 2 Energy Bill 2015 £85/MWh Paris Agreement CCS hydrogen oil and gas Spending Review 2015 Cost Challenge Taskforce CO2MultiStore climate change Clean Growth Strategy CCS Technology CCUS Cost Challenge Taskforce carbon CCS Lessons Learned UNFCCC CCSA Oil and Gas Authority