There are some solar panels on the roof of the Japanese Prime Minister’s residence, according to this web page on the official site.
Wikipedia tells me that the building of the German Chancellor’s residence has a 150 kW solar panel installation on its roof. All electricity not covered by that is bought from a special tariff that makes sure only renewable energy is used in generating the electricity.
In contrast, American president Obama still has no solar panels on the White House.
Lenz Blog 