To ensure that this act is implemented in a timely manner, the utilities and transportation commission may adopt rules under RCW 81.116.020 prior to July 1, 2019, and may accept tariff filings from a person with a substantial interest beginning thirty days after the effective date of these adopted rules. The utilities and transportation commission must suspend a tariff filing made before July 1, 2019, within thirty days of receipt of the filing. Any tariff filings made under this section may not take effect until after June 30, 2019.