IL HB4803

Creates the Electric Transmission Colocation and Siting Priority Act, establishing a mandatory priority order for siting new electric transmission facilities: first existing public utility corridors, then State highway corridors, then new corridors

Allows public utilities and transmission developers to construct high-voltage transmission lines (115 kilovolts or more) on public rights-of-way or along highways with Secretary of Transportation approval, which may be denied only for public safety concerns or highway interference

Requires the Secretary of Transportation to assign a project coordinator within 30 days of receiving a written request for corridor evaluation from a utility or transmission developer

Mandates development of a constructability report between the utility/developer and Department of Transportation that specifies siting terms and a timeframe during which relocation cannot be requested

Requires the Department to provide at least 10 years notice before requiring relocation of a high-voltage transmission line; if less notice is given or relocation occurs during the prohibited timeframe, the Department must pay 75% of relocation costs

Effective January 1, 2027