(7) Public utilities, as defined in Section 77-3-3, may provide a secure electronic interactive system for the submittal of bids requiring competitive bidding that shall be an additional bidding option for those bidders who choose to submit their bids electronically. Public utilities shall implement the provisions necessary to accept electronic bids from those bidders who choose to submit their bids electronically for all purchases requiring competitive bidding under this section. When construction bids are submitted electronically, the requirement for including a certificate of responsibility or a statement that the bid enclosed does not exceed Fifty Thousand Dollars ($50,000.00) on the exterior of the bid envelope, as indicated in Section 31-3-21, shall be deemed met by including such certificate or statement as an attachment with the electronic bid submittal.