Another area that I've neglected, of many I'm sure, is the cost of the solar powerplant structure and systems. The US DOE breaks the cost down like this:

Reflector = 25%
Structure = 40%
Heat collector element = 20%
Heat engine = 6%
Sun tracking controls = 5%
Other = 4%

My cost estimate assumed that the mirrors would be the overwhelmingly dominant cost component. So, perhaps I should increase the cost estimate of the powerplant components by 4-fold. Bummer. I'll have to do something about that....

!!!

Then again, I designed my own reflectors. So if I compare cost per kW I get this:

My design = $3.31 per installed watt
Their design = $2.00 per installed watt

Turns out existing designs are more than 30 percent less expensive than mine overall. Guess I chose the absolute most expensive mirror technology in the universe. Another fortuitous error! LOL. I've come to enjoy them frequently.