The U. of Chicago just released a working paper “Do Renewable Portfolio Standards Deliver?” that purports to assess the added costs of renewable portfolio standards adopted by states. The paper has two obvious problems that make the results largely useless for policy development purposes.
First, it’s entirely retrospective and then tries to make conclusions about future actions. The paper ignores that the high initial costs for renewables was driven down by a combination of RPS and other policies (e.g. net energy metering or NEM), and on a going forward basis, the renewables are now cost competitive with conventional resources. As a result, the going forward cost of GHG reductions is much smaller than the historic costs. In fact, the much more interesting question is “what would be the average cost of GHG reductions by moving from the current low penetration rate of renewables to substantially higher levels across the entire U.S., e.g., 50%, 60% etc. to 100%?” The high initial investment costs are then highly diluted by the now cost effective renewables.
Second, the abstract makes this bizarre statement “(t)hese cost estimates significantly exceed the marginal operational costs of renewables and likely reflect costs that renewables impose on the generation system…” Um, the marginal “operational” costs of renewables generally is pretty damn close to zero! Are the authors trying to make the bizarre claim (that I’ve addressed previously) that renewables should be priced at their “marginal operational costs”? This seems to reflect an remarkable naivete on the part of the authors. Based on this incorrect attribution, the authors cannot make any assumptions about what might be causing the rate difference.
Further, the authors appear to attribute the entire difference in rates to imposing an RPS standard. The fact is that these 29 states generally have also been much more active in other efforts to promote renewables, including for customers through NEM and DER rates, and to reduce demand. All of these efforts reduce load, which means that fixed costs are spread over a fewer amount of kilowatt-hours, which then causes rates to rise. The real comparison should be the differences in annual customer bills after accounting for changes in annual demand.
The authors also try to assign stranded cost recovery as a cost of GHG recovery. This is a questionable assignment since these are sunk costs which economists typically ignore. If we are to account for lost investment due to obsolescence of an older technology, economists are going to have go back and redo a whole lot of benefit-cost analyses! The authors would have to explain the special treatment of these costs.
Why do economists keep producing these papers in which they assume the world is static and that the future will be just like the past, even when the evidence of a rapidly changing scene is embedded in the data they are using?