Within eight years, says DaFT
http://www.dft.gov.uk/pgr/rail/pi/railelectrification.pdfGood news for passengers, ultimately, although Kintbury passengers etc, will have to change at Newbury. Good news for home owners, too, as the value of properties always tend to go up if they are near a station with electric trains to London, making it attractive for commuters. Not such good news for those locals seeking to buy a home, perhaps...