Open season - First cavern

HyStock will bring its hydrogen storage capacity to the market via open seasons, ensuring a fair and transparent process. If sufficient interest is confirmed through EoIs from qualified customers, the open season for the first cavern can be launched according to the commercial timeline. Participation is limited to qualified customers. Timely qualification is required, prior to the start of the open season. See the qualification process on this website.

The open season of the first cavern will consist of two phases: the reservation phase and the agreement phase.

Indicative Q2 2026 – Q4 2026

• This phase is intended to provide qualified customers with the opportunity to secure a reservation of storage capacity and formalize their interest. Qualified customers will be invited to sign a Reservation Agreement (RA), specifying the number of storage bundles they wish to reserve. 
  
  
• At the start of the reservation phase, qualified customers will receive an RA together with a tariff methodology and structure and/or a tariff range. The RA will also outline the allocation principles that will apply to the storage bundles offered during the open season.
  
  
• Signing the RA represents the first step involving a financial commitment. To confirm interest and to support the project’s development, the RA will include a breakup fee. The specific terms of this breakup fee will be detailed in the RA.
  
  
• At the conclusion of the reservation phase, the level of market interest and relevant market developments will be evaluated. Based on this assessment, a decision will be made on whether to proceed to the next phase of open season – the agreement phase. Customers who have signed an RA will be invited to participate in this next phase.

Indicative Q1 2027 – Q3 2027

• Following a successful reservation phase, the agreement phase of open season commences. This phase focusses on finalizing contractual agreements with customers who have signed an RA. 
  
  
• At the start of this phase, customers with an RA will receive the final version of the HSSA, including the confirmed tariffs and tariff structure.
  
  
• Storage bundles will be allocated to customers with an RA. If demand exceeds available capacity, a fair and transparent allocation mechanism – such as an auction or another suitable process – will be implemented.
  
  
• During this phase, the regulatory framework is expected to evolve. Any relevant updates or requirements will be incorporated into the final version of the HSSA.
  
  
• The signing of the HSSA's is currently scheduled to take place shortly before cFID. 

Our commercial process is strategically aligned with current market trends and the earliest planning milestones set by cFID. For the latest updates, please visit the Commercial timeline.