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.
Planning mode is enabled which means that any new construction will be paused (preventing trucks to make deliveries). Click to turn the planning mode off.