The more I research it, is not completely bogus only half bogus. They call a dark energy because it will not be destined to see the light of day of the power grid. They're talking about natural gas powering jet turbines to generate electricity on site for data centers mainly, if not exclusively, "behind the meter" they call it.

In conventional natural gas generating plants, they have a double cycle set up, also uses natural gas to power turbines, and then the waste heat is used for a secondary tapping, produces steam, used for turbines stage two. It nearly doubles the efficiency. I'm guessing that takes too much time to prepare for the "dark energy" in question in these facilities. One imagines they would eventually evolve to that method.

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1986 300SDL, 362K
1984 300D, 138K