Mich. Admin. Code R. 460.2545
Rule 45. The following customer service applications and contracts shall be retained for the periods listed:
(a) Applications for utility service for which contracts have been executed. | Destroy at option. |
(b) Applications for utility service used in place of contracts. | 1 year. |
(c) Contracts and card files, or other records thereof, with customers for utility service. | 1 year after expiration or cancellation. If the contracts are with other utilities for the purchase, sale or interchange of product, R 460.2519(b) applies. |
(d) Applications for utility service that were withdrawn by the applicant or not granted by the utility. | 1 year. |
(e) Contracts or sales agreements with customers and others for the sale of merchandise and appliances. | 1 year after sales agreement is discharged. |
(f) Contracts for the lease of equipment to customers, including receipts for this equipment. | 1 year after expiration of contract or return of equipment. |
(g) Applications and contracts for extensions covered by refundable deposits or guarantees of revenue and records that pertain to such contracts. | 1 year after entire amount is refunded. |
(h) Applications and contracts for extensions for which donations or contributions are made by customers or other individuals. | 6 years after expiration. |
Mich. Admin. Code R. 460.2545