Question to the Department for Transport:

To ask the Secretary of State for Transport, pursuant to the Answer of 9 February 2026 to Question 110889, when the shore power trial at Portsmouth International Port began; what the outcomes have been; and whether any evaluation has been produced.

The shore power demonstrator trial at Portsmouth International Port was publicly awarded nearly £20m of R&D funding in September 2023. Portsmouth International Port began delivery of the project shortly afterwards as part of the UK SHORE Zero Emission Vessels and Infrastructure (ZEVI) competition.

Most civil and electrical infrastructure works within the port side boundaries of Portsmouth International Port are now complete and the multi-berth shore power units are now on the berths. In November 2025, a successful dry connection test (without the provision of electricity) was completed, where one of the shore power units was plugged into Britanny Ferries’ Guillaume de Normandie vessel.

Separate to the UK SHORE funded project, Portsmouth International Port accepted a connection offer from Scottish and Southern Electricity (SSE). This connection offer was for a 15 Megawatt grid upgrade to secure the grid capacity for the shore power units. The Port is awaiting final details from SSE on energisation of the grid upgrade.

No specific evaluation for this project has yet been completed as the demonstration phase isn’t complete. A technical study is underway for all ZEVI projects, including Portsmouth, that will analyse the data generated throughout the multi-year demonstration period.