Numbers of alternatives to the existing process for ammonia synthesis, the Haber-Bosch Process, have been proposed in the past many decades, including the electrochemical synthesis in aqueous, molten salt or solid electrolyte cells. The energy consumption of making ammonia by using the Haber process with green hydrogen from electrolysis compare with making ammonia using the Birkeland–Eyde process. But other than Haber process the ammonia production is very low not for commercial purpose. For example, by heating an ammonium salt such as ammonium chloride NH4Cl in the presence of a strong alkali such as sodium hydroxide or calcium hydroxide.