Any easement for an electric transmission facility as defined in this chapter acquired contractually by a utility after July 1, 1979, shall give the landowner the option of receiving a single sum payment for the easement or receiving payment in annual installments of equal amounts including interest on the outstanding balance to be paid by the utility at a rate equal to the average rate paid during that year by the Bank of North Dakota on a certificate of deposit in an amount equal to the outstanding balance. The first annual installments shall be prorated to July first and all following annual installments shall fall due on July first. The option provided herein shall not apply to any easement providing for compensation of less than five thousand dollars. In the event the landowner elects to receive the compensation in annual payments, the benefits unpaid at the time of sale of the real estate to which the easement attaches shall    accrue to the purchaser of said real estate thereafter. The utility right-of-way agent shall inform the property owner of the owner’s option to choose annual installments.