Updates are available Correction dated 2019-02-06

Article History

Received: 19 January 2018

Accepted: 11 June 2018

First Online: 23 July 2018

Change Date: 6 February 2019

Change Type: Correction

Change Details: In the version of this Article originally published, there was a data entry error in Table 1 for a single variable, eligibility of non-renewable resources in a renewable portfolio standard. This affected the descriptive statistics in Table 1 and Fig. 4 and the regression results and efficiency variable in Table 2. It also affects parts of the text, Table 3 and the Supplementary Information. These corrections have now been made.

Competing interests

: The authors declare no competing interests.

: This research involved human subjects. It was approved with exempt status by the University of Utah, under protocol number 00063847. In accordance with this protocol, informed consent was provided by all study participants