South East reservoir
South East Strategic Reservoir Option (SESRO) – a new reservoir proposed by Thames Water in Oxfordshire. This will be the water source for the Thames to Southern Transfer Project.
We're planning to build a new water supply works and a new pipeline capable of transferring 120-million litres of water per day to help keep Hampshire’s taps and rivers flowing. In the longer term, the project will be capable of providing water to Thames Water and South East Water customers.
According to the Environment Agency, the South East needs to find more than 2.5 billion extra litres of water a day by 2050 to maintain its water supplies. To address this, we’re investing in new sources of water, such as new reservoirs and pipelines to transfer water from them to where it’s needed.
The Thames to Southern Transfer will allow us to take water from a new reservoir in Oxfordshire and transfer it down to our supply in Hampshire.
It’s one of a number of projects that will help secure future water supplies and reduce our reliance on Hampshire’s chalk stream rivers, helping to protect these vital habitats - especially during droughts when river levels are low.
We plan to build a new water supply works to treat the water taken from a planned new reservoir in Oxfordshire before being transferred to our supply network. This will be built on land to the west of the A34 near Drayton, next to the new reservoir at the point where water is taken.
Thames Water, Southern Water and Affinity Water have planned the new reservoir, known as Abingdon Reservoir, to provide a new source of water for the Thames to Southern Transfer system.
Following treatment at the water supply works, water would then be pumped through approximately 85km of new pipeline to several connections in Hampshire. Connections will also be provided to Thames Water at Newbury and South East Water at Basingstoke.
Over the next several years, we will be running detailed investigations and assessment to find the best route for the new pipeline. We’ll also be speaking to the local community in detail about our plans and running a formal consultation.
We are working with Thames Water and South East Water on these proposals, which are subject to further engagement, consultation, and planning consent. Although engagement has begun, the project is still in the early stages of development and completion won’t be for another 10 years. The information on this page may change as the options are developed further.
South East Strategic Reservoir Option (SESRO) – a new reservoir proposed by Thames Water in Oxfordshire. This will be the water source for the Thames to Southern Transfer Project.
A new water supply works will be located on land next to the new reservoir. It will treat the water from the reservoir to drinking water standards before being sent into supply.
A connection for a future pipeline from the new Thames to Southern Transfer pipeline to Thames Water’s Kennet Valley water resource zone.
A new connection and pipeline to our Kingsclere water resource zone.
A new connection and pipeline to our Andover water resource zone.
A connection for a future pipeline from the new Thames to Southern Transfer pipeline to South East Water’s water resource zone at Basingstoke.
A new connection to our Winchester (North) water resource zone.
A new connection to our Winchester (South) water resource zone.
South East Strategic Reservoir Option (SESRO) – a new reservoir proposed by Thames Water in Oxfordshire. This will be the water source for the Thames to Southern Transfer Project.
A new water supply works will be located on land next to the new reservoir. It will treat the water from the reservoir to drinking water standards before being sent into supply.
A connection for a future pipeline from the new Thames to Southern Transfer pipeline to Thames Water’s Kennet Valley water resource zone.
A new connection and pipeline to our Kingsclere water resource zone.
A new connection and pipeline to our Andover water resource zone.
A connection for a future pipeline from the new Thames to Southern Transfer pipeline to South East Water’s water resource zone at Basingstoke.
A new connection to our Winchester (North) water resource zone.
A new connection to our Winchester (South) water resource zone.
Here's a timeline of what we've done so far and how we plan to complete the project by 2040.
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