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The source calculates somewhat optimistically. They assume storage at 80bar, while mentioning that actual storage is at 200bar. They also assume 60% efficient conversion from methane to electricity, while using 55% in other parts of the paper. There is no accounting for transmission losses or the energy needed to procure the CO2. Cogeneration is again creative accounting. We're talking about supplying electricity, and heat isn't electricity.

Those reversible fuel cells... I'll believe in them when I can buy them. And a round trip efficiency of 80% is unbelievable when simple electrolysis of water, which is only half the round trip, isn't that efficient.




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