Two Zone 1 stations, Battersea Underground Station and Nine Elms Underground Station, will open to the public on Monday 20th September 2021.

Major construction on the 3km twin-tunnel railway between Kennington and Battersea Power Station, via Nine Elms, began in 2015.

The tube services will start on Monday 20 September, running from Kennington station on the Charing Cross branch.

The initial peak time service is 6 trains per hour, which will increase to 12 trains per hour by mid-2022. There will be 5 trains per hour during off-peak times, doubling to 10 trains per hour next year.

Sadiq Khan, Mayor of London, commented: "After an incredible effort from the huge number of people who worked on this project, it's fantastic that we are now on the final countdown to the Northern Line Extension opening later this month.

"The two new stations at Nine Elms and Battersea Power Station are the first new stations on the Northern line for 80 years. They will hugely improve connectivity between these two areas and the rest of London, and play a major part in the capital's recovery from the pandemic by supporting thousands of new jobs, homes and businesses."

Stuart Harvey, Director of Major Projects at TfL, added: "In just a few weeks' time, we'll be opening the first major Tube extension this century and welcoming our first customers to the new stations at Nine Elms and Battersea Power Station. It has been a huge collaborative effort with our London-based stakeholders and suppliers from around the UK. It's going to be a fantastic moment when this thriving south London neighbourhood makes it onto the Tube map for the first time, which will also highlight the vital importance of public transport in connecting communities and assisting London in its continuing recovery from the pandemic."

Councillor Ravi Govindia, Leader of Wandsworth Council and co-chair of the Nine Elms Vauxhall Partnership, commented: "It is fantastic to finally have a date for the Tube opening in Battersea for the first time, bringing long-awaited new travel connections to the area.

"This huge £1bn transport investment to extend the Northern line to Battersea Power Station and Nine Elms has been over 10 years in the making, so we are delighted that this growing Wandsworth neighbourhood is now firmly on the London Underground map.

"Our leadership and resolution with partners including TfL, GLA, Lambeth, Battersea Power Station and all local developers to transform the area from a transport backwater to a thriving centre for homes and jobs will bring benefits and opportunities for all our residents and businesses for decades to come."

Simon Murphy, CEO of Battersea Power Station Development Company, said: "We are delighted to have played a key role alongside TfL, Wandsworth Council and the Nine Elms Vauxhall Partnership in delivering the first major extension to the London Underground in nearly 25 years. The Northern Line Extension is a gamechanger for this area of London and an extremely significant milestone in the regeneration of Battersea Power Station, which is soon to be one of the most well-connected developments in the capital. We look forward to welcoming further visitors to the thriving riverside neighbourhood we are creating once the new Battersea Power Station Underground station is open on 20 September."

David Darcy, Project Director for the Ferrovial Construction Laing O'Rourke joint venture, FLO, added: "FLO has designed and constructed a crucial transportation system asset for London, which comes into service as the city's post-pandemic recovery begins. A project of this scale and complexity, with the challenges posed by COVID-19, has been a joined-up effort on so many fronts, proving the benefit of close collaborative working across the entire project at all levels. We are grateful to our supply chain and delivery partners and the local communities. Importantly, the NLE comes into service with an industry-leading safety performance and, underpinned by the culture of the project team and integrated delivery approach, has set a new standard for delivering major and complex transportation schemes for the UK."

A number of schemes making it easier for people to walk, cycle and use public transport in the Nine Elms and Battersea areas are also nearing completion. The Victorian railway arch in Nine Elms, known as Arch 42, will open up to create a vital new walking route between Nine Elms station, Nine Elms Lane and the River Thames.

The Northern Line Extension is the first major Tube extension in the 21st century and is supporting around 25,000 new jobs and more than 20,000 new homes.