U.S. Government
CIA World Factbook - Spain
U.S. State Department Background Notes - Spain
U.S. State Department Consular Information Sheet - Spain
U.S. State Department Country Commercial
U.S. Department of Labor, Bureau of Labor Statistics, International Section
CIA World Factbook - Portugal
U.S. State Department Consular Information Sheet - Portugal
U.S. State Department Background Notes - Portugal

Foreign Government Agencies
Comision Nacional de Energia

Oil and Natural Gas
Cepsa
Enagas
Gas Natural Group
Petroleos del Norte (Petronor)
Repsol-YPF
GalpEnergia
Lusitaniagas
Portgas
Galp Atlantico

Electricity
Endesa
Hidrocantabrico
Iberdrola
REE
Union Fenosa
Electricidade de Portugal
Energy Services Regulatory Authority - ERSE
Tejo Energia
Generg