Hydrogen can be made from coal or by splitting water using electricity from nuclear or solar power. Water electrolysis is cheaper for small amounts of hydrogen. To make it even cheaper, we need to improve how we make electrodes, use thin layers of electrolyte, and raise the temperature in the cells. Some promising methods are the General Electric Solid Polymer Water Electrolyzer and Teledyne Alkaline Water Electrolysis Cells, which work at higher temperatures. These changes could make hydrogen production more efficient and cost-effective.