Fig. 10. Effect of nitric acid production capacity on the cost of nitric acid for the electrolysis-based Haber–Bosch process combined with the Ostwald process, as well as for the plasma-based NO_X synthesis process. The full and dotted lines represent an electricity cost of 20 € MW h⁻¹ and 5 € MW h⁻¹, respectively. The high-pressure Haber–Bosch process becomes less energy-efficient upon scale-down below 10 t-HNO₃ day⁻¹.^14,110 The HB + Ostwald base-case, PL base-case, and PL potential case are the same as in Fig. 8.