• OECDiLibrary: Energy

Books, papers, and statistics on many aspects of energy from the OECD and IEA.

• UNdata Energy Statistics Database

Download energy data from statistical agencies throughout the United Nations. Series on energy cover topics such as consumption, exports, imports, and production.

• World Energy Council: Online Publications 
  Full-text of publications from this multi-energy non-governmental organization.
• Eurostat
  European Union Statistical Office

• US Department of Energy Data Explorer (DDE)
  Collections of numeric files, figures and data plots, multimedia and images, computer simulations, specialized databases, and interactive data maps.
• Solar Radiation Data (USA)
  Data on solar radiation and wind from the NCEI and NREL 
• UK Department of Business, Energy and Industrial Strategy 
  statistics on energy, climate change, energy efficiency, fuel poverty, building materials, etc.
• Statistisches Bundesamt (Germany)
  Energy statistics on electricity and gas production and distribution, energy consumption in industry, etc.
• Centraal Bureau voor de Statistiek (CBS)
  The Netherlands in figures

For an overview of more (secundary) data sources and statistics have a look at:

• Libguide Economics and Business - Secondary Data
• Libguide Spatial Sciences -  Data