The concept of remote solar plant giving piped hydrogen fuel is gaining strength with the likelihood of realization. Electricity (in 1977 U.S. $) for use in electrolysis with a 50 per cent load factor at the producing plant would be 1 cent/kWh now, and 1.5 cents (still 1977$) in 1985. Potential will be 1.5 V. Cost of 1 MBTU will be in the region of $5 (electrolysis). Photovoltaic electricity using Fresnel concentration and heat exchangers should cost 1 cent/kWh. H2 transport costs should be some 1 mill/1000 km. Examination of ten approaches gives a maximum hydrogen cost of $9/MBTU, a likely value of $5, and speculative laboratory possibilities which could give $1/MBTU.