Missouri regulators have issued an order supporting a Liberty Utilities -Empire District plan to add 600MW of wind generation capacity, the largest such expansion by an electric power provider in the midwestern US state.

The Public Service Commission (PSC) determined that Empire had presented “credible and persuasive” evidence that adding the wind capacity would generate customer savings of $169m over 20 years and $295m over 30 years, relative to the utility’s present resource plan.