Electroactive polymer expansion power cycle (100) converts thermal energy contained in working fluid (20) to electrical energy. Electroactive polymer expansion power cycle (100) comprises a pump (110), a boiler (120), a boiler electroactive polymer reservoir (130), an expansion electroactive polymer reservoir assembly (140), and a condenser (150). The boiler electroactive polymer assembly (140) is comprised of a transducer (10), that generates electricity resulting from the inflation and deflation of the boiler electroactive polymer reservoir (130). Transducer (10) is comprised of one or more polymer spacers (502) sandwiched between one or more top electrodes (504) and bottom electrode (506) pairs. The electroactive polymer assembly (140) is comprised of one or more electroactive polymer reservoirs that are similar in design to the boiler electroactive polymer assembly (130). These electroactive polymer reservoirs generate electricity through the same process as the electricity generated by the boiler electroactive polymer reservoir (140).