At Heriot Watt, we are delivering a new MSc programme in Subsurface Energy Systems (SES) that will educate you about unlocking energy resources with a low carbon footprint. This will be a stepping stone for your career in industry, government, non-government organisations (NGOs) or academia. The programme addresses key concepts in subsurface energy and CO2 storage, geothermal energy or transitional gas while integrating geoscience, engineering, political and societal aspects. It will appeal to geoscientists, reservoir engineers, governmental stakeholders and all those interested in the management of subsurface reservoirs used to switch from a fossil fuel-driven economy to a decarbonised one, using natural gas as a transitional energy resource. Its production from unconventional reservoirs comes with environmental risks that we have to assess and control. This degree is delivered jointly by The Lyell Centre and the Institute of GeoEnergy Engineering. The recent report by the Intergovernmental Panel on Climate Change predicts serious consequences from further emitting CO2 into the atmosphere, thereby accelerating man-made climate change. This requires a drastic decarbonisation of our economies by switching from fossil fuels to renewable energies like wind, solar, hydro, or geothermal or by implementing carbon capture and storage (CCS) at scale. Renewable energies can readily be used in the form of electrical power. When electricity production exceeds the demand, electricity can be stored in grids or batteries at limited capacity. At larger scale, electricity can be stored in the subsurface after conversion to, for example, hydrogen, thermal energy, or compressed air until needed, allowing for back-production within short and longer time scales of hours to years.