How can a rogue planet get energy for plants to use?

This rogue planet is a cold rocky world where liquid methane replaces water, hydrogen is used in place of oxygen, and a large moon.

I was thinking the large moon would have a large tidal pull that keeps the mantle active and generates tons of geothermal energy for the plants to use in place of sunlight. Or maybe this world could could be a moon that orbits a rogue gas giant. But I'm not exactly sure how all that works.

Either tell me how exactly that works and if it's sustainable, or give me another way the plants can get energy.

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How can a rogue planet get energy for plants to use?

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