Unbundling of delivery services; Commission review. The General Assembly finds that the offering of delivery services will, and is intended to, facilitate the development of competition for generation services, and that competition may develop for other services currently offered on a tariffed basis by the electric utility. The Commission shall open a proceeding to investigate the need for and desirability of different or additional unbundling of delivery services for some or all electric utilities 3 years from the date that a tariff for delivery services is first approved or allowed into effect pursuant to this Section. The Commission shall open an additional proceeding to again investigate the need for and desirability of different or additional unbundling of delivery services for some or all electric utilities, 3 years after the entry of its final order in the first investigation proceeding. The Commission shall issue its final order in each investigation proceeding no later than 6 months after the proceeding is initiated. In each such proceeding the Commission shall consider, at a minimum, the effect of additional unbundling on (i) the objective of just and reasonable rates, (ii) electric utility employees, and (iii) the development of competitive markets for electric energy services in Illinois. Specific changes to the delivery services tariffs of individual electric utilities to implement findings and directives stated in an order in an investigation proceeding initiated under this Section shall be addressed through individual electric utility tariff filings. The Commission may also, in accordance with Section 16-108, upon complaint or upon its own initiative without complaint, upon reasonable notice, enter upon a hearing concerning the need and desirability of requiring additional or other unbundling of delivery services offered by electric utilities.