Coherent Resilience 2021 – Baltic (CORE 21-B) was a Tabletop Exercise (TTX) on the Baltic States and hybrid threats to the regional electric grid with a focus on critical energy infrastructure protection. The TTX took place 20-24 September 2021 in Vilnius, Lithuania. The aim of the exercise was to support the national authorities and electricity system operators of the Baltic States in ensuring supply of electricity to civilian and military consumers and mitigating the possible disruption in the light of hybrid threats over the Baltic region due to vulnerabilities caused by close proximity of unsafe Belarusian NPP and the process of synchronization of the Baltic States power grid with the Continental Europe grid. CORE 21-B was a five-day regional, multilateral, interagency, and public-private sector event that was executed with an academic seminar, a three-day TTX, and a distinguished visitors’ day that included after-action briefings. This report focuses largely on syndicate responses to the exercise scenario vignettes and injects to include capturing key takeaways and recommendations. The event brought together over 100 participants from 12 NATO and European Union countries or partner nations, who came from 35 different organizations representing electricity supply and energy security stakeholders.