Rapid City, SD-based Black Hills Corp. sees renewable natural gas (RNG) as an eventual sustainable driver for continued earnings and customer growth throughout its eight states of utility operations, CEO Linn Evans said earlier this month.

Black Hills is “working pretty aggressively” on RNG, Evans told analysts during the second quarter 2021 earnings call. There are four projects in place, from which the holding company is learning a lot. Six to 10 other projects are being negotiated, along with “a fairly long backlog of possibilities.”

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In the recent past, the utility holding company...