LONDON — London’s subway opened two new stations Monday in the network’s first expansion since the 1990s, a development that Mayor Sadiq Khan said will play a key role in the capital’s recovery from the pandemic.

The two new Northern Line stations are at the Battersea Power Station and Nine Elms, both south of the River Thames and in areas of southwest London that have seen massive building and regeneration work in recent years.

The London Underground network was last expanded in the late 1990s with the extension of the Jubilee Line. Authorities borrowed $1.37 billion from the Treasury for this latest project, which will be partly funded by contributions from developers.