Thanks GRA - My concerns are not related to the strides that are being made in electrolysis - as I believe we will see major improvements in all areas of "renewables" in coming decades. My concern is that the lifecycle costs of the cleaning, compressing, delivering the dense phase hydrogen to compete as a "liquid" fuel will be simply too costly to ever compete with any other technology for any significant use - why?
- todays vision of "renewable" sources of the energy are mainly solar/wind - that are highly intermittant and potentially more costly than expected (Texas grid failure in my home town!)
- A choice in design/construction of the cleaning, compressing and storage of H2 will have to made - either battery storage to allow 24/7 operation, or 100-110% capacity to match the "intermittant" power levels of renewables - at a significantly higher lifecycle cost. Can the entire grid be redesigned to "share" the intermittant power across much of US? Maybe, and could solve some of such issues and significantly reduce battery storage requirements to level out power levels with more renewables.
- IMHO, whatever turns out to be the source of energy storage for the majority of our vehicular requirements (of all types) will also be the grid stabilizer to allow more renewables to be our energy source - and if designed properly will provide the resilience needed. If this is battery storage (certainly appears to be), again IMHO, we need to reserve battery production capacity for vehicles and figure out aggregation and smart charging to maximize the effectiveness.
- It seems a good compromize with use of H2 is reducing carbon content of nat gas - to the max that works with our exising infrastructure. Seems logical that more effecient electrolysis and the relatively low compression requirements to get into the pipelines would be an realistic approach in the near term.