From Google AI: General feelings toward hydrogen use are a mix of high-stakes optimism, cautious skepticism, and intense debate over its role in the clean energy transition. While it is widely recognized as a crucial, versatile tool for decarbonizing hard-to-abate industrial sectors (like steel and chemicals) and heavy-duty transport, there is significant skepticism regarding its efficiency for widespread applications like heating homes or passenger cars.
This is also a concern: cost to use: Hydrogen is significantly more expensive to use for energy than natural gas or propane. It currently costs 3–5 times more per Btu than natural gas, and up to 10–13 times more when produced via renewable electricity (electrolysis). While cleaner, high production, storage, and transportation costs make it a much higher-priced option for heating or fuel.