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