Instead of a flat tariff, run the electrolyser only in the hours when the market price is at or below a ceiling you choose. Edit the sample price-duration curve below to match your market (it ships with an illustrative shape, not live exchange data — swap in your own hourly/block price distribution for a real answer).

Hours where the price-duration curve is at or below the chosen ceiling become the effective capacity factor; their hours-weighted average price becomes the effective electricity price.

Total energy consumed over the year divided by the specific energy efficiency.

Capital cost is annualized using the Capital Recovery Factor (CRF). OPEX is a fixed percentage of total CAPEX.

Annual electricity cost based on power consumption and grid/PPA tariff.