the City of London bridge in Blackfriars is the world 's largest solar-powered bridge . Over 4,400 photovoltaic cells occupy a roof area of 511 tonnes . Being the first station to span the river Thames , the bridge has always had high demands on power . Clean energy provides up to 50 percent of the requirements of Blackfriars railway station , located on the bridge . The array is estimated to reduce carbon emissions by 6000 square meters per year .
the City of London bridge in Blackfriars is the world 's largest solar-powered bridge . Over 4,400 photovoltaic cells occupy a roof area of 511 tonnes . Clean energy provides up to 50 percent of the requirements of Blackfriars railway station , located on the bridge . The array is estimated to reduce carbon emissions by 6000 square meters per year .