N.D. Cent. Code § 57-33.2-14: Preservation of records

Every company required to make a return and pay any taxes under this chapter shall preserve records of retail sales as the commissioner may require. Every company shall preserve for a period of three years and three months all invoices and other records of electricity delivered to a consumer in this state. All of these books, invoices, and other records must be open to examination at any time by the commissioner or any duly authorized agent of the commissioner.