WORLD NUCLEAR ENERGY
Electricity systems
Annual energy is one part of a larger power-system question.
Distinguish three questions
Capacity asks how much power is available at a moment under the stated conditions. Generation asks how much electricity was produced over a period. Reliability asks whether the system can meet demand through time and events. A simple annual calculation answers only the second question.
Keep the comparison consistent
Use net electrical capacity when comparing energy delivered to the grid. Use the same year length and a clearly stated capacity factor. Include transmission, demand shape and other resources in an actual system study.
Our Demand Balance demonstration compares annual quantities only. It does not model outages, dispatch, seasonal patterns, storage, grid constraints or the availability of electricity at a particular hour.
Sources: IEA25. Checked 9 November 2026. Full context in Sources.