Use flowing water to spin a turbine connected to a generator
Build a hydroelectric system with a dam, penstock, turbine, and generator
Use a micro-hydro setup in a stream or river with sufficient flow
Use tidal water movement to drive turbines
Use wave motion to convert mechanical energy into electricity
Use a water wheel connected to a generator for low-power applications
Use falling water from an elevated tank to spin a turbine
Use pumped-storage systems to move water and generate power when released
Use electrolysis to split water into hydrogen and oxygen, then generate electricity from hydrogen in a fuel cell
Use osmotic power where fresh water and salt water meet through a membrane
Use piezoelectric devices activated by water pressure or flow
Use thermoelectric systems if water is part of a heat-difference setup