An uncharacteristically large point source of methane. Given that most methane emissions distributions are heavily skewed, a small number of super-emitters can account for the majority of aggregate emissions across the supply chain. Emissions distributions vary widely by basin and production type, so there is some debate over what constitutes a super-emitter. Highwood defines a super-emitter as any emission even with mass flux rate that exceeds 10 kg/h methane and an ultra-emitter as any source above 100 kg/h .