In the new centre at the national library in London, visitors can plough through 7.8 million scanned pages of historic newspapers and 4.8 million archived British Internet domain websites, totalling more than a billion individual web pages.
It also holds the British Library's collection of television and radio news broadcasts, which includes more than 40,000 programmes dating back to 2007 and is growing at a rate of 60 hours every day across 22 news outlets.
The new facility means researchers can access material within the library itself in central London, rather than trekking to the archive.
The vast cache of actual newspapers was sited at an outdated facility in suburban London, but has migrated to a new, high-tech storage unit in Yorkshire, northern England.
It contains more than 750 million pages of newspapers and periodicals from nearly every local, regional and national newspaper, and takes up more than 20 kilometres of shelves.
Keating said the collection was "a vital part of the memory of the nation -- recording every aspect of local, regional and national life", and was continuing to grow at a rate of more than seven metres every week.