sentences:  Charterhouse Street is also the home of a 31 MWe combined heat and power plant operated by Citigen (E.ON) and located within and beneath the former Port of London Authority's Smithfield cold storage facility.The site on the corner of Farringdon Road was occupied by the 1960s Caxton House which was demolished in 2009 as part of the Farringdon station extension.The nearest London Underground stations are Barbican at the east end of Charterhouse Street and Farringdon at the west end.