UK Power Networks - What is an electrical substation?
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What is an electrical substation?

A substation reduces electricity voltage so that it is easier and safer to deliver electricity to homes and business.

We have thousands of electricity substations around London, the South East and East of England, and some of these are on customers' land.

A substation will usually be protected by fences or within a building. Substations should only be entered by trained staff and you will see yellow and black ‘danger of death’ signs on the entrances. Each substation also has a unique number which helps us to locate it.

The size of a substation can vary depending on whether they serve residential houses or commercial and industrial units. Schools and institutions such as hospitals often have their own substation

We regularly maintain substations however sometimes we need your help to spot issues. If you’ve noticed the following please report it online

  • Fly tipping
  • Graffiti
  • Rotten or broken fencing
  • Overgrown weeds, shrubs and trees

Do not enter a substation for any reason because you could be electrocuted and it’s against the law.

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