Tideway Taps Bond Market Again With £250M Sterling Blue Bond for Thames Tunnel

Bazalgette Finance, the financing arm of Tideway, has issued a £250 million fixed-rate blue bond maturing in 2036, its second sterling blue bond following its first issuance in July 2025. Proceeds fund projects that protect the River Thames from sewage discharges, with the Thames Tideway Tunnel now operational. The repeat issuance marks Tideway’s shift from green bonds to blue bonds as the project transitions from building to running.

 

Details of the Bond

 

Tideway has issued a new bond. It came through its financing arm. The bond is worth £250 million. It is a fixed-rate blue bond. It matures in 2036.

The bond is the company’s second blue bond. It follows a first issuance. That was in July 2025. Both are sterling blue bonds. This reflects a new approach.

 

The Purpose

 

The bond funds environmental projects. These protect the River Thames. They address sewage discharges. This concerns combined sewer overflows. The tunnel tackles these.

The tunnel is a major project. It is among London’s largest. It addresses river pollution. It is now operational. This underpins the bond.

 

The Timing

 

The timing reflects the project’s status. The tunnel delivers environmental benefits. This backs the second bond. It rests on tangible outcomes. These replace construction promises.

The move marks a transition. It shifts from green to blue bonds. This reflects the project’s phase. It moves from building to running. The bond reflects this shift.

 

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The Blue Bond Context

 

The bond fits a specific category. Blue bonds are within green bonds. They direct proceeds to environments. These are marine and freshwater. This defines the category.

The company has a strong framework. Its finance framework earned a top rating. This was from a ratings agency. It applies across its programme. This supports the issuances.

 

Significance of the Issuance

 

The issuance shows market appetite. It reflects demand for infrastructure debt. This is tied to environmental outcomes. The repeat issuance confirms this. It demonstrates investor interest.

The issuance signals further activity. The company has a large programme. This points to future issuances. It reflects a maturing market. Blue bonds backed by operational assets are growing.