When enabled, power generated here can also be used by consumers that are set to consume surplus power only. Surplus mode is useful for generators for which any unused power goes to waste (e.g. solar panels) and can be instead provided to surplus consumers. Surplus generators always have a priority over non-surplus ones to generate power.
Priority for electricity generation. In case there is extra power, a generator with higher priority (a lower number) will generate power while the ones with lower priority will be on standby.
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