Electrolytic water-splitting (e.g., using low-carbon electricity obtained from renewables) can facilitate the reduction of the CO2 footprint of hydrogen production. In addition, this provides a synergistic approach for helping the power grid balance operations, which is becoming increasingly challenging as more solar and wind power are injected in the grid . According to the US Energy Information Administration (EIA), the share of renewables in the electricity generation was 21% in 2020 and is expected to increase to 42% by 2050 (growth mostly driven by growth in solar/wind power) . The intermittent nature of solar/wind power causes dynamic mismatches of supply/demand in the grid and disrupts market prices and other key operational variables (e.g., frequency and voltages) . Given the increasing share of renewable power in power grid, load (demand) flexibility has become an important operational resource .