Of all the countries across Central and Eastern Europe, Poland has been among the most vocal about its energy-related security vulnerabilities. Sticking to coal, which continues to generate the majority of the country's electricity, Poland is under increasing pressure to diversify its fuel mix for security and environmental reasons. LNG, nuclear and renewables are all on the table for altering its energy and power supply. And with the Polish Presidency of the EU Council scheduled to commence this summer, energy will be high on the agenda. Contributor Honorata Nyga - Łukaszewska profiles Poland's National Energy Security Strategy and in doing so provides us a baseline understanding of where the country stands presently on energy and how it plans on bolstering its energy security future.

Kornel Andzsans-Balogh contributes the fourth, and final installment, of our coverage of threats and challenges to Visegrad state energy security with a detailed look at Hungary. While the country has significantly increased its national security through transit diversification, through transmission interconnectors for electricity supply, and through greater gas storage, it remains vulnerable to excess country-of-origin dependence on natural gas from the Russian Federation. Having said this, Hungary's accomplishments are worth noting and instructive to other nations facing the same or a similar problem, not only in Europe but around the world.