Papers › The Value of Ancillary Services for Electrolyzers
The Value of Ancillary Services for Electrolyzers
Andrea Gloppen Johnsen, Lesia Mitridati, Donato Zarrilli, Jalal Kazempour
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Although primarily designed for hydrogen production, electrolyzers can support power systems by providing various ancillary services, opening new revenue streams that enhance their economic viability. This paper investigates the participation of an electrolyzer in frequency-supporting reserve markets, analyzing how bid structures and activation intensities affect its value. We develop a mixed-integer linear program to co-optimize electricity procurement and reserve provision, and analytically derive the opportunity cost of reserve provision, which determines the optimal bid price. Using historical price and frequency data from western Denmark, we show that asymmetric, hourly reserve products often entail no opportunity cost and can increase profits by up to 47%. However, energy-intensive reserves may disrupt hydrogen production and risk unmet demand. Our findings reveal that flexible bidding can mitigate these risks while maintaining profitability. We also highlight the benefits of diversifying across reserve products and offer two recommendations: System operators should reconsider reserve bid structures to better accommodate electrolyzers, and electrolyzer owners should not overlook energy-intensive reserve services when hydrogen demand is flexible.
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