Cool water restrictions and flooding risks may currently hardly limit this value, but climate change might present a somewhat greater challenge on longer time scales in these respects. For a given source different supply options (for gas for instance inland production, import through pipelines or LNG regasification terminals, storage facilities) need to be summed up and related to energy demand (ECOFYS, et al., As opposed to the (de-rated) generation capacity margin, the indicator accounts primarily for extreme and/or weather-related events.