The new report from London details results of an energy survey of 170 buildings. Thermal imaging of the 775-room Buckingham Palace showed heat flowing from closed, curtained windows, pouring from the roof and streaming through cracks in the walls, according to the Daily Mail. A team of energy surveyors gave it a green score of 0 out of 10 and report that the building is better at heating the air outside than inside.

Other energy inefficient buildings include the Department of Environment (on the second place), the Treasury, the Ministry of Defence and Portcullis House, which opened in 2001 and contains the offices for about a third of the Members of Parliament.

The Daily Mail weighed in with the entire roster of the "Dirty Dozen" as the stir over the energy survey and its results continued:

1.    Buckingham Palace
2.    DECC (Defra) [The Department of Energy and Climate Change (Department for Environment, Food and Rural Affairs)]
3.    Ministry of Defence
4.    Horse Guards Barracks
5.    Shell Building
6.    Home Office
7.    Houses of Parliament
8.    Treasury
9.    Portcullis House
10.  MI6 HQ
11.  Albert Hall
12.  St James' Palace

The most energy efficient building in London identified by the thermal survey team is The Hong Kong and Shanghai Banking Corporation (HSBC) tower block in Canary Wharf.