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In January 2019, Mayor Sadiq Khan announced a delay to the opening of the project from December 2020 to 2021, due to a variety of construction delays.<ref>{{Cite web|last=Khan|first=Sadiq|date=3 January 2019|title=Oral Update to the Mayor's Report|url=https://www.london.gov.uk/questions/2019/0001|url-status=live|access-date=11 September 2021|website=Mayor's Question Time|archive-date=11 September 2021|archive-url=https://web.archive.org/web/20210911181947/https://www.london.gov.uk/questions/2019/0001}}</ref><ref>{{Cite web|last1=Plimmer|first1=Gill|last2=Pickard|first2=Jim|date=21 December 2018|title=London's Northern Line extension to Battersea delayed by a year|url=https://www.ft.com/content/7ac0080a-0455-11e9-99df-6183d3002ee1|url-status=live|access-date=11 September 2021|website=[[Financial Times]]|archive-date=11 September 2021|archive-url=https://web.archive.org/web/20210911182004/https://www.ft.com/content/7ac0080a-0455-11e9-99df-6183d3002ee1}}</ref><ref>{{Cite news|last1=Prynn|first1=Jonathan|last2=Sleigh|first2=Sophia|date=21 December 2018|title=TfL under fire as Battersea Tube extension is delayed by 'miscalculations'|work=Evening Standard|location=London|url=https://www.standard.co.uk/news/transport/tfl-under-fire-as-battersea-tube-extension-is-delayed-by-miscalculations-a4023386.html|access-date=8 May 2020|archive-date=23 October 2020|archive-url=https://web.archive.org/web/20201023202028/https://www.standard.co.uk/news/transport/tfl-under-fire-as-battersea-tube-extension-is-delayed-by-miscalculations-a4023386.html|url-status=live}}</ref> In June 2019, it was announced that installation of track had been completed, and that an engineering train travelled the full length of the tunnel from Kennington to Battersea for the first time.<ref>{{Cite web|date=18 June 2019|title=First engineering train travels full Northern Line Extension|url=https://www.railwaypro.com/wp/first-engineering-train-travels-full-northern-line-extension/|access-date=11 September 2021|website=Railway PRO|language=en-US|archive-date=11 September 2021|archive-url=https://web.archive.org/web/20210911114956/https://www.railwaypro.com/wp/first-engineering-train-travels-full-northern-line-extension/|url-status=live}}</ref><ref>{{Cite web|last=|date=14 June 2019|title=Northern Line extension due to open in September 2021 as trackwork completed|url=https://www.railwaygazette.com/infrastructure/northern-line-extension-due-to-open-in-september-2021-as-trackwork-completed/48721.article|url-status=live|access-date=11 September 2021|website=Railway Gazette International|language=en|archive-date=11 September 2021|archive-url=https://web.archive.org/web/20210911111955/https://www.railwaygazette.com/infrastructure/northern-line-extension-due-to-open-in-september-2021-as-trackwork-completed/48721.article}}</ref>
By February 2020, construction of the extension was nearly complete, with platforms, escalators and the [[London Underground#Roundel|Tube Roundel]] installed in the stations.<ref>{{Cite web|url=https://www.standard.co.uk/news/transport/battersea-power-station-tube-signs-unveiled-underground-northern-line-a4367426.html|title=Battersea Power Station signs unveiled at new Northern Line hub|date=20 February 2020|website=Evening Standard|access-date=13 April 2020|archive-date=21 February 2020|archive-url=https://web.archive.org/web/20200221144206/https://www.standard.co.uk/news/transport/battersea-power-station-tube-signs-unveiled-underground-northern-line-a4367426.html|url-status=live}}</ref> In March 2020, work on the extension was paused due to the [[COVID-19 pandemic in the United Kingdom|COVID-19 pandemic]]. Work resumed at the end of May 2020 with [[social distancing]] and other mitigation measures.<ref name=":30">{{Cite web|last1=Eshalomi|first1=Florence|last2=Khan|first2=Sadiq|date=7 September 2020|title=Update on the Northern Line Extension|url=https://www.london.gov.uk/questions/2020/3133|url-status=live|access-date=11 September 2021|website=Mayor's Question Time|archive-date=11 September 2021|archive-url=https://web.archive.org/web/20210911182009/https://www.london.gov.uk/questions/2020/3133}}</ref> In July 2020, the roof of the Battersea station was handed over to the Battersea Power Station developer to allow their construction to begin.<ref name=":30" /> In
Kennington station was moved from [[Travelcard Zone 2|Zone 2]] to the [[Travelcard Zone 1|Zone 1/2 boundary]] in May 2021, in preparation for the opening of the extension.<ref>{{Cite web|last=Bennett|first=Ella|date=13 May 2021|title=Kennington on the Northern Line line is changing zones as lockdown eases|url=https://www.mylondon.news/news/south-london-news/london-underground-northern-line-station-20588563|access-date=11 September 2021|website=MyLondon|language=en|archive-date=11 September 2021|archive-url=https://web.archive.org/web/20210911181947/https://www.mylondon.news/news/south-london-news/london-underground-northern-line-station-20588563|url-status=live}}</ref> In June 2021, it was announced that the extension will have [[4G|4G mobile signal]], unlike the majority of the tunnelled Underground network in 2021.<ref name=":33">{{Cite web|last=Lydall|first=Ross|date=22 June 2021|title=Tube to get full mobile phone coverage by 2024|url=https://www.standard.co.uk/news/london/london-underground-full-mobile-phone-coverage-2024-b941881.html|url-status=live|access-date=11 September 2021|website=[[Evening Standard]]|language=en|archive-date=11 September 2021|archive-url=https://web.archive.org/web/20210911230734/https://www.standard.co.uk/news/london/london-underground-full-mobile-phone-coverage-2024-b941881.html}}</ref> The 4G network will also support the future [[Home Office]] Emergency Services Network, which will replace the current [[Airwave Solutions|Airwave]] emergency services communication network.<ref name=":33" /> By summer 2021, final testing and commissioning was underway, with regular test trains running from July 2021.<ref>{{Cite web|last=White|first=Chloe|date=11 July 2021|title=Transport for London Northern Line Extension project meets a major milestone as trial operations begin|url=https://www.railadvent.co.uk/2021/07/transport-for-london-northern-line-extension-project-meets-a-major-milestone-as-trial-operations-begin.html|url-status=live|access-date=11 July 2021|website=RailAdvent|language=en-GB|archive-date=11 July 2021|archive-url=https://web.archive.org/web/20210711130949/https://www.railadvent.co.uk/2021/07/transport-for-london-northern-line-extension-project-meets-a-major-milestone-as-trial-operations-begin.html}}</ref>
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