There are challenges in terms of demonstration, particularly in relation to the nine technology readiness levels, the highest level being commercialization. I'd say the challenges really come up as commercialization nears, when the time comes to carry out demonstrations, figure out regulatory issues and address access to the grid. That's when testing sites are needed, as well as programs for demonstrating technologies and their effectiveness.
On September 27th, 2022. See this statement in context.