A device may receive heat from a production fluid with a source heat exchanger. A device may transfer the heat to a working fluid with the source heat exchanger. A device may expand the working fluid in a turbine. A device may generate electricity with the turbine. A device may exhaust heat from the working fluid to an ambient liquid with a sink heat exchanger. A device may compress the working fluid after the sink heat exchanger and before the source heat exchanger. FIG. 4