(1) A utility must file a tariff adoption notice with the commission when either of the following changes affects an existing tariff:

(a) Transfer of the operating control or ownership; or

(b) Utility name change.

(2) The acquiring utility must file the tariff adoption notice if there is a change in ownership or operating control. The surviving utility must file the tariff adoption notice if there is a name change.

(3) Content of the tariff adoption notice must contain, at a minimum, the following:

(Name of Utility) adopts and makes its own in every respect all tariffs, supplements and amendments filed with the Washington Utilities and Transportation Commission by (Name of Previous Utility or Prior Name of the Utility) prior to (Date).

(4) The tariff adoption notice may be made effective on one day's notice.

(5) In the event of a change in control or ownership, as described above, the utility adopting the tariff must file to incorporate the adopted tariff in its own tariff within sixty days of the date of the filing of the adoption notice. In the event of a name change the time limit is one year.

(6) Until the utility that adopted a tariff refiles the tariff in its own name, all changes after the adoption must include:

(a) The name of the utility whose tariff was adopted at the top of the sheet; and

(b) The name of the utility that adopted the tariff at the bottom of the sheet.