Polymer solar cells are fabricated on a silver nanowire-polymer composite electrode. The power conversion efficiency based on a blend of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) is comparable to control devices with indium tin oxide (ITO)-glass electrodes. The devices are highly flexible and can be bent to a maximum 8% strain with negligible damage to device efficiency.