NSP stands for New Standard Price, which is a rule used to reflect aluminum ingot prices in product prices.It is revised every three months. The rule is to take the three-month average of the monthly average bullion quotes published in the Nihon Keizai Shimbun (excluding the immediately preceding month, the average is calculated for the three months prior to that), round off the first place, and add 10 yen.Yen price per kg.