If you are analyzing a power plant and are looking to calculate the cost to generate electricity, you'll need to know four things:
Check out this post to calculate how much fuel is needed.
Then, take a look at this data set to find the cost of fuel and M&O costs.
If these aren't the units you need, try some of these conversions:
A mill is equal to 1/1,000 of a U.S. dollar, or 1/10 of one cent.
For information on future energy-generating projects, EIA has projected values on projects through 2050.