From 2000 to 2016, Japan imported 20% less oil and 23% less natural gas than it would have done in the same period without energy efficiency interventions. Germany and the United Kingdom, which correspond to the largest gas markets in Europe, have achieved a reduction in imports of natural gas from Russia equal to 30% of the European total. Short-term energy security has improved, as energy efficiency has reduced the daily gas demand peak. This means that imports have not been reduced on an annual basis, but in the periods of greatest demand. Given the last developments in the geopolitical scene energy efficiency is becoming more relevant than ever.