Bazalgette Tunnel Limited (“Tideway”) is a U.K.-based independent regulated infrastructure provider established in 2015. The company's purpose is to design, finance, construct, and commission the Thames Tideway Tunnel in London. Tideway marked the tunnel construction as complete in March 2024, and the tunnel was fully connected and activated in February 2025. The project is currently in its system commissioning and testing phase, ahead of full operation and handover to Thames Water from the end of 2025.