I was surprised to see some resistance to the cost causation. I think it might be helpful for our financial discussions to become more aware of the state of the art in this topic.
Here is a section of administrative law drawn from energy utility regulation
Section 791.30 Cost Causation Principle
http://www.ilga.gov/commission/jcar/admincode/083/083007910000300R.html
Here is a more detailed slide presentation about how the cost causation principle is recognized in case law and how the principle is applied to effect cost allocation – again, in an energy regulation context
Here is a complete article from economists on “Cost-Causation and Integration Cost Analysis for Variable Generation”
https://www.nrel.gov/docs/fy11osti/51860.pdf
Dr. Milton L Mueller
Georgia Institute of Technology
School of Public Policy
