What is the round-trip efficiency of power-to-hydrogen?

Electrolysis (70–80%) × fuel cell (50–60%) = overall round-trip efficiency of 35–48%. Significantly lower than batteries (85–95%) but enables seasonal storage and uses existing gas infrastructure.

Is methanation more or less efficient than hydrogen?

Power-to-methane adds Sabatier reaction step (70–80% efficiency), giving: electrolysis × Sabatier × CCGT = ~25–35% round-trip efficiency. Lower than P2H2 but methane uses existing gas grids.

When does P2G make economic sense?

P2G is economically attractive only when surplus renewable electricity prices approach zero or negative (curtailment). As renewable penetration exceeds 50–60% of generation, curtailment episodes increase significantly.

Power-to-Gas Round Trip Efficiency Calculator

Calculate the round-trip efficiency of power-to-gas (P2G) systems converting excess electricity to hydrogen or methane and back to electricity.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the scenario you are assessing. Calculate the round-trip efficiency of power-to-gas (P2G) systems converting excess electricity to hydrogen or methane and back to electricity. Use the p2g round trip result to inform your calculation.

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Frequently Asked Questions

What is the round-trip efficiency of power-to-hydrogen?

Is methanation more or less efficient than hydrogen?

When does P2G make economic sense?