N.D. Cent. Code § 49-19-05: Percentage of native natural gas to be used

Whenever native natural gas is produced in this state in commercial quantities, any person having a franchise to furnish gas to the public, which franchise is dated after March 9, 1933, shall use fifty percent, or its equivalent, of native natural gas as developed if the source thereof is located not more than six miles [9.66 kilometers] from any established gas pipeline.