Chrome isn't exactly difficult to get in large quantity (at the point in the game where it matters).
Love that Geothermal generator idea personally. How much in energy profit do you expect it to produce? I would personally expect around 300 - 400 EU/t considering the cost, but I would still use them if 250 EU/t in profit energy was produced. Simply because of the ease of use. Those large gas turbines are a pain in the ass, the steam ones are nice though considering the boilers function as centrifuges for the cost of a small amount of coal.
Still waiting on those Large Diesel Generators Greg... Tired of using all this extra diesel fuel as a home remedy for all sorts of stuff. (works great for removing stains though)
There is an idea for lead + fuel - make the large diesel generators need maintenance less at the expense of a bit of output, or more pollution when that is eventually added.
ed: actually just read on up on what TEL does... so ya, the opposite of what i just said above, except the more pollution part.