More on math markup
I saw your table at Flue gas emissions and it looks nice.  That led to your discussion of Wiki's less than perfect math markup.  You pointed out that your PNG generated at Wikicities was more compact: 

than the example you provided with Wiki markup:

So I played around and came up with this example: 

Which may not be perfect, but it is alot closer to your first one.  Cheers.   

I believe placing a message on a userpage is the only way to create the message notice.  Many users do put responses directly under the message for continuity, but they would still need to place a notice on the other userpage to get a quick response.  

The smaller font is achieved with the  \begin{matrix} \end{matrix} tags .  (Note braces not parens - they are hard to distinguish on my monitor). This is noted in Help:Formula#Fractions, matrices, multilines section under "Small Fractions", where it adds that the tag forces "\textstyle".  I am no expert, so I can't provide further guidance.

Concerning the power plant article, you could provide a more prominant link to your article (I will demonstrate), but I think the main article should remain an overview with links to subsidiary articles.