Discover some of the major network investments that have evolved our transmission system since the supergrid was first switched on.

In the summer of 1953 a circuit-breaker was closed to energise Britain’s 275kV supergrid for the first time. Read on to discover some of the technology behind the achievement.

Near a small village in Nottinghamshire, Britain’s 275kV supergrid was switched on in front of an assembled crowd. Discover the places that played host to the early supergrid.

Britain’s supergrid heralded a time of remarkable engineering prowess and innovation. Discover some of the key figures behind the progress of electricity at the time.

At National Grid we’ve invested billions over recent decades to maintain and evolve our transmission network, and today we’re embarking on the Great Grid Upgrade – the biggest overhaul of the electricity grid in generations.