The National Grid is a system that delivers electricity and gas to homes and businesses across a country. It connects power stations, substations, and consumers through a network of transmission lines and pipelines. This infrastructure ensures that energy is available where and when it is needed, balancing supply and demand. In the United Kingdom, the National Grid is managed by the company National Grid plc, which oversees the operation and maintenance of the electricity and gas networks. The system plays a crucial role in energy security and helps integrate renewable energy sources, such as wind and solar power, into the energy mix.