Engineering

Aerospace engineering

Range (aeronautics)

Computer science

Power to gas

Physical chemistry

Mechanical engineering

Hydrogen

Nuclear engineering

Organic chemistry

Renewable energy

Work (physics)

Process engineering

Environmental science

Chemistry

Electrode

Power station

Hydrogen production

Electrolyte

Electrolysis

Electrical engineering

International Journal of Hydrogen Energy

The investment costs of water electrolysis represent one key challenge for the realisation of renewable hydrogen-based energy systems. This work presents a technology cost assessment and outlook towards 2030 for alkaline electrolysers (AEL) and PEM electrolysers (PEMEL) in the MW to GW range taking into consideration the effects of plant size and expected technology developments. Critical selected data was fitted to a modified power law to describe the cost of an electrolyser plant based on the overall capacity and a learning/technology development rate to derive cost estimations for different PEMEL and AEL plant capacities towards 2030. The analysis predicts that the CAPEX gap between AEL and PEMEL technologies will decrease significantly towards 2030 with plant size until 1–10 MW range. Beyond this, only marginal cost reductions can be expected with CAPEX values approaching 320–400 $/kW for large scale (greater than 100 MW) plants by 2030 with subsequent cost reductions possible. Learning rates for electrolysers were estimated at 25–30% for both AEL and PEMEL, which are significantly higher than the learning rates reported in previous literature.

Projecting the future cost of PEM and alkaline water electrolysers; a CAPEX model including electrolyser plant size and technology development