Ref. Ares(2021)3127833 - 10/05/2021 Model version of 31-08-2020 Petten, date JRC.C - Energy, Transport and Climate (Petten)  Energy Storage EUROPEAN COMMISSION  JOINT RESEARCH CENTRE  Dear Madam/Sir,  The European Commission, Directorate-General for Joint Research Centre, referred to below  as  the contracting authority, is planning to award the contract resulting from the above  procurement procedure. The procurement documents consist of the contract notice, this  invitation letter, the draft contract and tender specifications with their respective annexes. All  documents are available at the following TED eTendering website$^{1}$: https://etendering.ted.europa.eu/cft/cft-display.html?cftId=8412 This contract will be awarded in two steps. As a first step, if economic operators are interested  in this contract, they are invited to submit a request to participate in one of the official  languages of the European Union. In a second step, only selected candidates will be invited to  submit a tender. Any tender received from a legal or natural person not invited to tender will  be rejected. Economic operators must submit requests to participate and tenders exclusively by email to  jrc-ptt-procurement@ec.europa.eu.  The time-limit for receipt of requests to participate is indicated under Heading IV.2.2 of the  contract notice where local time shall be understood as local time at the contracting authority's  location (the location indicated under Heading I.1 of the contract notice). The time-limit for  receipt of tenders will be indicated in the above TED eTendering website when the selected  candidates are invited to submit a tender.  Candidates or tenderers must ensure that their submitted requests to participate or tenders  contain all the information and documents required by the contracting authority at the time of  submission as set out in the procurement documents. $^{1}$ Subscription to the call for tenders at the above link allows interested economic operators to receive e-mail  notifications when new information or documents are published. Subscription is free of charge and does not  involve any commitment to submit a tender. European Commission, Joint Research Centre - Petten, Westerduinweg 3, 1755 LE Petten, Netherlands  1. Submission of requests to participate and tenders.  Subject:  Supply of one low temperature water electrolysis test station equipment  including warranty and associated maintenance services  JRC/PTT/2021/CPN/0763 