It's still good news, since methane is a more potent greenhouse gas - depending upon the timeframe and calculation method it's generally reckoned to have between 30 and 100 times the warming potential of C02 [1]. Moreover a power station then has a CO2-rich exhaust stream, which is probably the best place for industrial carbon capture.

[1] https://www.scientificamerican.com/article/how-bad-of-a-gree...

Sunnyvale does this! The "Sunnyvale Materials Recovery and Transfer Station" (SMaRT Station) is out by the bay, and there is a waste water treatment plant right next door. Methane is captured from "capped" landfills and is used to power the treatment plant. I believe the plant is nearly 100% powered by these captured gases.

Doesn't smell great over there, but it sure is interesting and pretty smart!