Blackfriars bridge in the City of London is the world 's largest solar - powered bridge . The good old bus . Over 4,400 photovoltaic cells occupy a total area of 500 square meters . Clean energy provides 50 % of the power of Blackfriars railway station , located on the bridge . The array is estimated to reduce carbon emissions by 511 tonnes per year .
Blackfriars bridge in the City of London is the world 's largest solar - powered bridge . Over 4,400 photovoltaic cells occupy a total area of 500 square meters . Clean energy provides 50 % of the power of Blackfriars railway station , located on the bridge . The array is estimated to reduce carbon emissions by 511 tonnes per year .