Minn. Stat. § 237.072: LIMITATION ON RATE CHANGE.

(a) After December 15, 1997, the commission, notwithstanding any provision to the contrary, shall not allow an incumbent telephone company with more than 1,000,000 access lines in Minnesota to change its retail rates for telecommunications services without a determination of its revenue requirement pursuant to section 237.075 unless the incumbent telephone company is regulated pursuant to sections 237.76 to 237.773.

(b) If, prior to December 15, 1997, the incumbent telephone company petitions the commission to become subject to an alternative regulation plan under sections 237.76 to 237.773, paragraph (a) shall not apply to the petitioning company until 270 days after the date of the filing of the petition.