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[en] Highlights: • Gas CC plant without CO_2 emissions producing carbon nanotubes instead is presented. • Gas CC power plant output per ton fuel: 2.7 ton CO_2, $909 electricity & $0 of CNT. • CNT CC gas power plant per ton fuel: zero ton CO_2, $835 electricity & $225,000 CNT. • CNTs and pure O_2 are produced in a molten carbonate electrolyzer from split CO_2. • Zero CO_2 emission coal power plant producing CNTs instead is presented. - Abstract: Molten carbonate electrolyzers offer a pathway to capture emitted CO_2 from the flue gas of the power plants and transform this greenhouse gas emission at low energy and high yield instead into a specific, value added, hollow carbon nanofiber product, carbon nanotubes. The present day value of the carbon nanotubes product is ∼10,000 that of proposed, or in place, current carbon tax costs of $30 per ton, strongly incentivizing carbon dioxide removal. The recent progress in high-temperature molten carbonate electrolysis systems for carbon dioxide utilization and the impact these advances have on developing a CO_2-free fossil fuel power plant for electricity generation is presented. A thermodynamic model analysis is presented for a molten Li_2CO_3 electrolysis system incorporated within a combined cycle (CC) natural gas power plant to produce carbon nanofibers (CNF) and oxygen. Such a CC CNF plant system is shown to require 219 kJ to convert one mole of CO_2 to carbon, and generates electricity at higher efficiency due to pure oxygen looped back to the gas turbine input from the CO_2 splitting, with the added advantages that (i) the CC CNF plant emits no CO_2 and (ii) all CO_2 is converted to value added carbon nanotubes useful for strong, lightweight construction, batteries and nanoelectronics. Converting to power and ton units, per metric ton of methane fuel consumed the CC CNF plant is thermodynamically assessed to produce 8350 kW h of electricity and 0.75 ton of CNT and emits no CO_2, while the CC plant produces 9090 kW h of electricity and emits 2.74 ton CO_2. The required energy balance for a carbon nanotube production from an analogous coal power plant consumes a larger fraction of the coal energy, and encourages co-generation with renewable electric energy.