The N – 1 formula describes the ability of the technical capacity of the gas infrastructure to satisfy total gas demand in the calculated area in the event of disruption of the single largest gas infrastructure during a day of exceptionally high gas demand occurring with a statistical probability of once in 20 years.
Tuairisc is ea foirmle N – 1 ar an méid is féidir le hacmhainn theicniúil an bhonneagair gáis an t-éileamh iomlán ar ghás sa limistéar arna ríomh a shásamh i gcás shuaitheadh an bhonneagair gáis is mó lá atá éileamh ard urghnách ar ghás ann a bhíonn ann uair sa 20 bliain de réir dóchúlacht staitistiúil.