What is

Generation reserve margin is an indicator to show redundant supply against demand.

Electricity cannot be stored in great abundance as it is generated and used at the same time. Therefore, we must have some redundant supply at any time, in case there is an accident or failure at the site, or unexpected, significant demand increase happens due to severe temperature change.
We call this redundant supply "reserve," and "generation reserve margin" shows the percentage of redundant supply against demand.

Calculation method of generation reserve margin in Tohoku Electric Power Electricity Forecast

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