To ensure the safe and orderly implementation of delivery services, each electric utility shall submit to the Commission no later than March 1, 1999, a delivery services implementation plan for non-residential customers and no later than August 1, 2001, a delivery services implementation plan for residential customers. The delivery services implementation plan shall detail the process and procedures by which each electric utility will offer delivery services to each customer class and shall be designed to insure an orderly transition and the maintenance of reliable service. The Commission shall enter an order approving, or approving as modified, the delivery services implementation plan of each electric utility no later than 60 days prior to the date on which the electric utility must commence offering such services.