Elected to the Public Service Commission in November 2000, re-elected in 2006. Clark holds the PSC portfolio on electric generation and transmission. As such, he is active in state and regional efforts to develop North Dakota’s vast energy exporting potential and provide affordable, reliable energy to consumers. Since joining the Commission, Clark has overseen regulatory proceedings that have facilitated hundreds of millions of dollars in new investment in North Dakota through expanded wind, coal and petroleum infrastructure.

He is the 2nd Vice President of the National Association of Regulatory Utility Commissioners (NARUC) and is the immediate past Chairman of the Telecommunications Committee of NARUC. He has testified multiple times before committees of both the U.S. Senate and the U.S. House of Representatives on matters related to telecommunications and energy.