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Why are Power Grids so Large?

Former Community Member
Former Community Member
Why are power systems so large and interconnected? For example, what technical obstacles prevents the US eastern interconnection from being 8 isolated islands? Why not separate them by ISO/RTO? Why does every power grid in the world strive to be as large as geography allows?


Better yet why not have scattered power plants about (with redundancies of course) feeding load radially? A lot simpler and a lot less to go wrong.

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    And you can see the advantage of UK wide grid on "gridwatch.co.uk.

    The amount of wind generation seems to change very slowly, it is often at about the same level for a week or more, presumably because a spell of windy weather takes this long to cross the country even though different places within the UK will be calm one day and windy the next.
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    And you can see the advantage of UK wide grid on "gridwatch.co.uk.

    The amount of wind generation seems to change very slowly, it is often at about the same level for a week or more, presumably because a spell of windy weather takes this long to cross the country even though different places within the UK will be calm one day and windy the next.
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