Revisiting Japanese energy saving

I first visited Japan a few months after the 2011 Tōhoku earthquake and tsunami . I returned for another few weeks in 2019. During my first trip, the Japanese were still very much in the grip of recovering from the earthquake, tsunami and the resultant disaster at the Fukushima Daiichi nuclear plant. All of Japan's reactors, which produced 25% of their electricity, were shut down indefinitely. These plants almost produced a large proportion of the total energy consumed in buildings, when considering that natural gas is rarely used: for the vast majority of the population, air conditioning is ubiquitous and the need for heating rare. The disaster had a major impact on Japan. Firstly, despite being blessed with one seemingly inexhaustible resource, its stoic and respectful people, Japan isn't blessed with mineral resources, including natural gas, coal or oil, which all has to be imported. Given its distance from gas sources like Russia and Australia, that means expens...