Iowa regulators have approved a natural gas rate increase of $3.4 million, or 2.1%, for North Dakota-based Black Hills Corp.'s gas distribution utility operations in the state. The Iowa Utilities Board (IUB) approved a settlement submitted in January by Black Hills' Iowa Gas Utility Co., which originally filed with the IUB for a $4.7 million, or 2.9%, increase last June. The settlement-based increase will average about $1.80 more monthly for residential customers and $1.50 more each month for commercial customers.

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