Energy supply consists of all the primary energy sources used in power generation as well as direct fuel production. Increasing the share of renewables – a defining feature of the energy transition – and particularly wind and solar in the energy mix is an effective method of reducing the emissions. This is due to the inherently clean nature of these sources, but also their high efficiency. Steam methane reforming coupled with carbon capture, utilization and storage (CCUS) can be used to produce ‘blue’ hydrogen. The final critical element of the energy transition is contribution of the nuclear energy and specifically development and use of small and micro-modular reactors (SMR and MMR).