Waste water is often high in ammonia. Because discharging ammonia laden water into the environment, even in wastewater treatment plants, can cause problems, nitrification is often necessary to remove the ammonia. This may be a potentially sustainable source of ammonia in the future because of its abundance and the need to remove it from the water anyway. Alternatively, ammonia from waste water is sent into an ammonia electrolyzer (ammonia electrolysis) operating with renewable energy sources (Solar PV and Wind turbine) to produce hydrogen and clean treated water. Ammonia electrolysis may require much less thermodynamic energy than water electrolysis (only 0.06 V in alkaline media).