Consider the application I mentioned above, US20210257895 “Systems and methods for generating electricity”. This is the abstract:
Provided herein is a system for generating electrical current including a transducer subsystem having an upper end and a lower end, the transducer subsystem generating electrical current responsive to objects being dropped individually from the upper end to the lower end under the influence of gravity; and a return subsystem for returning a plurality of the objects collectively to the upper end using upthrust through a fluid body. A method for generating electrical current includes dropping objects individually from an upper end to a lower end of a transducer subsystem under the influence of gravity, wherein the transducer subsystem generates electrical current responsive to the dropping; harvesting the electrical current; and returning a plurality of the objects collectively to the upper end using upthrust through a fluid body.