Survey on Households and the Environment 
Classification by characteristics of the reference person
Percentage of dwellings, by level of studies completed by the reference person and type of energy used
Units: %  over the total number of dwellings

,With one of the following energy sources,Electrical  energy,Channelled gas,Liquid Petroleum Gases / Gas tank,Wood,Liquid fuels,Other source of energy or fuel  :Total,Other source of energy or fuel: Of this solar energy,
TOTAL,100.0,100.0,40.5,42.1,6.7,12.5,8.1,0.9,
Without studies,100.0,99.9,22.3,66.7,12.3,11.2,8.2,0.4,
Primary education or the equivalent,100.0,100.0,39.9,42.3,7.5,14.2,7.8,0.5,
Stage one secondary education,100.0,100.0,24.4,58.6,6.7,10.8,10.3,1.7,
Upper-secondary education,100.0,100.0,48.8,32.7,4.4,11.9,8.8,1.0,
Intermediate level-professional education,100.0,100.0,46.5,32.7,5.3,12.2,6.3,1.1,
Higher level -professional education,100.0,100.0,51.4,27.8,4.2,12.0,8.0,2.0,
1st cycle university studies,100.0,99.9,49.9,30.9,3.7,11.9,7.7,1.5,
2nd or 3rd cycle university studies,100.0,100.0,61.4,19.7,3.4,12.7,6.9,1.0,
Does not know/ Does not answer,100.0,100.0,.,78.1,46.9,27.9,46.9,.,
Notes:

.Data protected by statistical secrecy

Source: National Statistics Institute