Initial report of the Linlithgow Natural Grid project, page-3

Looking at that table, 9.3 year payback with a life of 10 years.

Assumes 60% electrical efficiency for LIFE of units. We all know the stacks degrade over time, even the new improved ones will be down to 55% or lower after a couple of years (2 yrs = 17,520hrs), probably well below 55%, that alone would take payback to over 10 years, even with a 2m pound subsidy.

No mention of cost of input, gas which will change over time, What's the assumption on gas price?

Also on those numbers, the Finning unit looks far better with 1400kWe compared to CFCL for a cap cost of only 2.84m pound for 20 year life vs 150Kwe output of CFCL with a cap and maintenance cost of 2.15m pound over half the life. The only aspect that makes the CFCL come near it is the subsidy. However it still gives out nearly 10 times the power and plenty of heat that can be piped!!

If I was the person dishing out the money for those 400 homes for the project, despite the 2m pd subsidy for CFCL, I wouldbe going for the Finning or the SAV UK units every time. Both have much more bang for buck, give enough electricity to possibly power 400 homes, plenty of heat that can be piped, and save more Co2.
It actually highlights what I've been stating for years, the BlueGens are simply way too expensive!!