Solid oxide: The Specialist of electrolysis

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Key takeaways

• Solid oxide needs only 37–42 kWh per kg of hydrogen — the lowest of all four technologies, but only with heat or steam supplied.
• At 700–900 °C, heat pays part of the bill: with waste heat it is the cheapest of the four, without it the most expensive.
• The heat brings four real engineering challenges: thermal cycling, degradation, materials and sealing, and hot balance of plant.
• Its natural homes are refineries, ammonia and methanol, and e-fuels — where spare heat, steady power and hydrogen demand sit together.
• Physics works; demand sets the pace. Find the heat, then choose the stack.

Episode guide

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