Black Hills Corp. utilities absorbed more than $600 million in added costs in February related to the impacts from extreme cold weather.

The bulk of the $565 million in additional charges for the Rapid City, SD-based operator were attributed to the natural gas utilities in Arkansas, Colorado, Iowa, Kansas, Nebraska and Wyoming.

“During this extreme weather event, the company’s electric and natural gas systems performed remarkably and delivered energy safely and reliably to its customers,” said CEO Linn Evans during the first quarter 2021 earnings call. “Our utilities all performed exceptionally well during the deep freeze of Storm Uri.”

The initial estimates of the incremental commodity costs to serve its natural gas and electric utilities’ customers’...