"ucg fuelled power generation in the former Soviet Union has been in units of up to 150MW (thus 200MW is not a big leap) ... "
I have serious doubts that the Soviets used a 150MW GT during the 1950s - 1970s when they were big on UCG. Granted the syngas production from say the Angrenskaya UCG station reached this level on energy equivalent basis but I don't think it was used directly in a single GT. Much of the gas was burnt in boilers. At the time GT units were much smaller than today. For example the Shataskaya station had a 12 MW GT unit running in the 1960s and there was a plan to add a 48 MW GT - but that never occurred.
Still syngas use in GT was demonstrated, which is the main point. I feel proponents are being a bit lax with their statements, which can look really good to those not following closely.
BTW, how many wells will CXY need for a 400 MW plant?? Following on from my LNC post, you can see its also gonna be a lot - but much more manageable - about 60 or so. Still upscaling would be nice. I like 20 - 30 as a nice round number to make it easy to manage effectively. More than this and I reckon there's gonna be control issues.
Scale-up to 1200 MW plant will be a big pain IMO - probably not feasible using current design.
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