- Power, Politics and Pragmatism: The British National Grid



Want to know more about these tunnels? Go watch Geoff Marshall`s video over at Londonist!

• Inside National Grid`s Power Tunnels -- and thanks to the National Grid for letting me film down in the London Power Tunnels: this isn`t a sponsored video, although they did go out of their way to show Geoff and me around!

Back in the 1920s, electricity was generated by hundreds of small companies in towns and cities across the country. They were all different and mostly incompatible: London alone had 24 voltages and 10 frequencies. How did we get from there to the billion-pound tunnel projects of today?