Based on the engine performance of ALL high output Japanese designs (mainly due to materal issues rather than design problems) it is probable that the Japanese would have required far more than the normal time frame common in the Western nations. This does not even begin to consider the resources necessary to actually construct a super heavy bomber.
I agree, the Japanese had great difficulties in particular in getting high-performance engines to work, due to to many projects at the same time, lack of co-operation between army and navy projects and lack of high-quality materials for engines.
But as I said, the war in the pacific would have to be radically different in order for the Japanese to pursue such an aeroplane. In fact I agree that in any pacific war even close to OTL the G10N (and to lesser extents the G5N and G8N) would have been a ridiculous waste of resources and personnel.
However I do believe that with time the plane could have been made operational, though likely with reduced characteristics then those given on Wikipedia, somewhere between 1946-49.
How much EXCESS electrical capacity did Japan have in 1944? For that matter how much excess capacity existed in 1943?
I don't know, do you?
How much of Japan's capacity was degraded by U.S. strategic bombing (which was far more destructive than that over Germany)?
In 1943? Much less. In 1945? No idea, I don't know to what extent the USAAF targeted Japanese electricity production. Do you?
How much additional generating capacity did the USSR bring on line between 1937 and 1949?
I don't know, do you?
However I do acknowledge that my analogy of the USSR was wrong. Particular after realizing a mistake I made in reading the table of the USSR, the numbers I took was from 1936 in regards to the USSR, the electricity production of 1937 was roughly 36,000,000,000 KwH. I apologize for that mistake.
But while on this subject, I wonder why you never have denounced any successful 'tube-alloy projects' that are used from time to time in timelines on this board, on the same reasons that you denounce German and Japanese atomic bomb projects?
Electricity production in the UK was in 1937 28,760,000,000 KwH, only 2,000,000,0000 more then Japan, and much lower then the German electricity production.
As was the case with Germany, what they had in 1937 isn't half as important as how much the U.S. (and Canada) ADDED from 1940 onward. Just U.S. Government production doubled from 1941-45 and total generation increased by 30% (average of 7.5% each year) in the same time frame. Even using the 1937 figures you provided for the U.S., which doesn't account for several HUGE hydro projects, this mean that the U.S. added 37,000 KwH (million). Put another way the U.S. ADDED 150% of Japan's TOTAL 1937 generating capacity (or 78% of Germany's TOTAL 1937 capacity).
And you still haven't posted a single number the Manhattan projects (or for that matter the post-war Soviet, French and British projects) in an either monthly, bi-monthly, quarterly, half yearly, yearly or total electricity cost.
However I do acknowledge that the USA added a tremendous amount of hydro-electric electricity generation particularly from the Tennessee Valley Authority project in particular post -42 when these dams was becoming finished.
But, the figures I gave was for Germany only. Not added Austria, Bohemia&Moravia, Poland, Norway&Denmark, BeNeLux, Yugoslavia, Greece or France, whose electricity production would also have been available for Germany to use which would add about ~47,300,000,000 KwH. Which together with the German would mean an total electricity production of ~96,200,000,000 KwH or about 80% of the total USA production.
And while the USA electricity production during the war increased, so did the German (though not that of occupied Europe).
Do you still believe that Germany could not afford an atomic bomb project on the cost of electricity?