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! http://londonpowertunnels.co.uk - http://nationalgrid.com

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?

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