A system comprising: a waste heat recovery heat exchanger configured to heat a heating fluid stream by exchange with a heat source in a crude oil associated gas processing plant; and a modified Goswami cycle energy conversion system (810, 855) including: a first group of energy conversion system heat exchangers (816, 818) configured to heat a first portion of a working fluid by exchange with the heated heating fluid stream, the working fluid comprising ammonia and water; a second group of energy conversion system heat exchangers configured to heat a second portion of the working fluid, the second group of energy conversion system heat exchangers including: a first heat exchanger configured to heat the second portion of the working fluid by exchange with a liquid stream of the working fluid; and a second heat exchanger configured to receive the second portion of the working fluid from the first heat exchanger and to heat the second portion of the working fluid by exchange with the heated heating fluid stream; a separator configured to receive the heated first and second portions of the working fluid and to output a vapor stream of the working fluid and a liquid stream of the working fluid; a first turbine and a generator, wherein the turbine and generator are configured to generate power by expansion of a first portion of the vapor stream of the working fluid; a cooling subsystem including one or more cooling elements configured to cool a chilling fluid stream by exchange with a cooled second portion of the vapor stream of the working fluid; and a second turbine configured to generate power from the liquid stream of the working fluid. a waste heat recovery heat exchanger configured to heat a heating fluid stream by exchange with a heat source in a crude oil associated gas processing plant; and a modified Goswami cycle energy conversion system (810, 855) including: a first group of energy conversion system heat exchangers (816, 818) configured to heat a first portion of a working fluid by exchange with the heated heating fluid stream, the working fluid comprising ammonia and water; a second group of energy conversion system heat exchangers configured to heat a second portion of the working fluid, the second group of energy conversion system heat exchangers including: a first heat exchanger configured to heat the second portion of the working fluid by exchange with a liquid stream of the working fluid; and a second heat exchanger configured to receive the second portion of the working fluid from the first heat exchanger and to heat the second portion of the working fluid by exchange with the heated heating fluid stream; a first group of energy conversion system heat exchangers (816, 818) configured to heat a first portion of a working fluid by exchange with the heated heating fluid stream, the working fluid comprising ammonia and water; a second group of energy conversion system heat exchangers configured to heat a second portion of the working fluid, the second group of energy conversion system heat exchangers including: a first heat exchanger configured to heat the second portion of the working fluid by exchange with a liquid stream of the working fluid; and a second heat exchanger configured to receive the second portion of the working fluid from the first heat exchanger and to heat the second portion of the working fluid by exchange with the heated heating fluid stream; a first heat exchanger configured to heat the second portion of the working fluid by exchange with a liquid stream of the working fluid; and a second heat exchanger configured to receive the second portion of the working fluid from the first heat exchanger and to heat the second portion of the working fluid by exchange with the heated heating fluid stream; a separator configured to receive the heated first and second portions of the working fluid and to output a vapor stream of the working fluid and a liquid stream of the working fluid; a first turbine and a generator, wherein the turbine and generator are configured to generate power by expansion of a first portion of the vapor stream of the working fluid; a cooling subsystem including one or more cooling elements configured to cool a chilling fluid stream by exchange with a cooled second portion of the vapor stream of the working fluid; and a second turbine configured to generate power from the liquid stream of the working fluid.