The document discusses transitioning to a new energy system backbone in Northwest Europe. It summarizes that current energy systems rely heavily on fossil fuels like coal and natural gas, but renewable resources like solar and wind are growing. It also notes uncertainties around managing variability from renewables as coal and nuclear capacity closes. The role of natural gas in providing flexibility is discussed. Finally, it outlines how hydrogen could play an increasing role in the future, transitioning from grey hydrogen today to blue hydrogen using carbon capture and eventually green hydrogen from renewable electricity.