A system comprising: a waste heat recovery heat exchanger (1, 2, 3, 4, 5, 6, 7) 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 energy conversion system (910, 960, 990) including: a first group of energy conversion system heat exchangers (916, 918) 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 rectifier configured to receive the heated first and second portions of the working fluid and a third portion of the working fluid and to output an overhead discharge stream and a liquid stream, the third portion of the working fluid being at a lower temperature than the heated first and second portions of the working fluid; a cooling subsystem including one or more cooling elements configured to cool a chilling fluid stream by exchange with the overhead discharge stream; and a turbine configured to generate power from the liquid stream of the working fluid. a waste heat recovery heat exchanger (1, 2, 3, 4, 5, 6, 7) 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 energy conversion system (910, 960, 990) including: a first group of energy conversion system heat exchangers (916, 918) 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 rectifier configured to receive the heated first and second portions of the working fluid and a third portion of the working fluid and to output an overhead discharge stream and a liquid stream, the third portion of the working fluid being at a lower temperature than the heated first and second portions of the working fluid; a cooling subsystem including one or more cooling elements configured to cool a chilling fluid stream by exchange with the overhead discharge stream; and a turbine configured to generate power from the liquid stream of the working fluid. a first group of energy conversion system heat exchangers (916, 918) 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 rectifier configured to receive the heated first and second portions of the working fluid and a third portion of the working fluid and to output an overhead discharge stream and a liquid stream, the third portion of the working fluid being at a lower temperature than the heated first and second portions of the working fluid; a cooling subsystem including one or more cooling elements configured to cool a chilling fluid stream by exchange with the overhead discharge stream; and a turbine configured to generate power from the liquid stream of the working fluid.