Siemens Smart Infrastructure and the NATO Cooperative Cyber Defence Centre of Excellence (CCDCOE) have signed a Memorandum of Understanding (MoU) to continue the cooperation on cybersecurity for critical infrastructure. The CCDCOE organized annual high-level cyber defence exercise Locked Shields exercise provides a key pillar to jointly build up defence capabilities. With the new agreement, the parties advance their existing cooperation on cyber security training for power grids. In experimenting with grid control software Spectrum Power, Siemens gains valuable insights on the potential attack vectors and can thoroughly test new security features or protocols for its products and solutions.