The theoretical foundations of liberalization of the energy markets. Pre-liberalisation and liberalization paradigm. Unbundling, the antimonopoly policy of the EU, European Commission vs. national incumbents and governments. 

Mandatory literature:

Cameron, P.D. (2007): Competition in Energy Markets: Law and Regulation in the European Union, 3-36

Buchan, D. (2009): Energy and Climate Change: Europe at the Crossroads, 20-27,49-78

Schubert, S.R.; Pollak, J.; Kreutler, M. (2016): Energy Policy of the European Union, 148-166

You may find useful:

Buchan, D. (2009): Energy and Climate Change: Europe at the Crossroads, 28-48