Journal of Earth Energy Engineering utilize PKP Preservation Network (PN) to digitally preserve all published scholarly content. PKP has developed the PKP Preservation Network (PKP PN) to digitally preserve OJS journals. The LOCKSS program offers decentralized and distributed preservation, seamless perpetual access, and preservation of the authentic original version of the content. The PKP PN ensures that journals that are not part of any other digital preservation service (such as CLOCKSS or Portico) can be preserved for long-term access.