The green hydrogen dream is currently facing a difficult reality: electrolysers are expensive to build and operate, and many projects are struggling to secure the high utilization required for a bankable business case, often due to a lack of immediate, large-scale hydrogen demand. These plants have high upfront capital costs, and if they sit idle, the financial return evaporates, making debt financing difficult. However, what if we stopped viewing the electrolyser merely as a hydrogen factory and started seeing it as a crucial energy storage and grid flexibility asset? This reframing is essential to address the core problem facing high-renewable grids: intermittency.
Too much of a good thing
This problem is particularly acute in electricity grids with high shares of renewable power generation capacity. Stephen Mettler in an excellent paper, “Electrification is Not Enough,” illustrates how the German and Dutch electricity grids, which are already running at about 50% intermittent renewable generation, are struggling with spiraling costs. As capacity climbs higher, the fixed cost of renewables (LCOE) is being spread over less useful energy, causing the delivered energy cost (LCOEu) to spike because too much power is being wasted, or curtailed. Traditional solutions like short-duration batteries are great for smoothing minute-to-hour fluctuations, but they can’t effectively handle the multi-day shortfalls or multi-day excesses—the “Dunkelflaute” problem. This inflexible demand is threatening to derail industrial electrification and lock Germany into a prolonged cost crisis.
Introducing “Reactive demand”
This is where the concept of “reactive Demand,” also proposed by Mettler offers a tactical solution. Mettler argues that for electrification to be cost-competitive, we need assets that can ramp consumption up or down for multiple days straight in response to supply. He proposes using electrolysers for upward reactive demand: instead of letting excess power be wasted (spilled), the grid directs it to the electrolyser to produce hydrogen. The key is the mechanism: a demand capacity contract.
A contract for availability
Mettler suggests that a government entity or utility should offer a long-term capacity contract—perhaps €150,000 per MW per year for a decade or more—to an electrolyser plant. This contract provides the secure revenue anchor that makes the high upfront cost of the electrolyser bankable. In return, the electrolyser gives the grid a “put option,” guaranteeing a buyer for otherwise valueless, curtailed power. By utilizing this spilled energy and distributing the system’s fixed costs over more energy delivered, this arrangement provides system savings that are forecast to justify the capacity payment.
Texas could be a perfect fit
This reactive demand framework is highly applicable to the Texas ERCOT market, which faces similar high-penetration challenges. Texas is suffering from a surge in renewable energy curtailment, with over 8 TWh of wind and solar curtailed in 2024. This chronic curtailment directly mirrors the costly “spill” problem described in the paper. Critically, Texas has an ideal market for reactive demand integration: it possesses over 900 miles of hydrogen pipelines and uses the largest amount of gray hydrogen in the United States. This established pipeline and industrial demand provides the necessary low-risk off-take market for upward reactive demand to be bankable, making it a powerful solution to reduce curtailment losses and stabilize generator revenues in ERCOT.
Exhibit 1. Renewable power generation curtailed in Texas. (Source: ERCOT, EIA, Modo Energy).
Choosing the right technology
The efficacy of reactive demand depends on the consuming asset’s ability to ramp up and down quickly. For grid-integrated reactive demand applications, the flexibility of the electrolyzer technology is paramount.
- Proton exchange nembrane (PEM) electrolyzers are currently the best-suited for rapid response due as they can handle wide and quick power fluctuations, making them ideal for ancillary services and co-location with intermittent power.
- The emerging anion exchange membrane (AEM) electrolyzers are also suitable for this application, as they offer fast response times and operate effectively over a wide range, combining the flexibility of PEM with the lower cost potential of alkaline systems.
- Traditional alkaline electrolyzers (AWE) are cheaper but generally less dynamic, performing best with consistent power, although their flexibility is constantly improving.
The adoption of dynamic technologies like PEM or AEM is necessary to ensure the electrolzser can precisely follow the grid signal and maximize the utilization of otherwise wasted renewable energy. This approach uses the electrolyzer not just to make hydrogen, but to become a vital grid stabilizer, which may be a far more economically viable market need in the near and medium term over reducing the carbon intensity of hydrogen uses.
– Uday Turaga
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