The Estonian Competition Authority has been an integrated authority already since 2008, encompassing the functions of a competition authority and sector regulators. We have been able to take full advantage of such an organisational structure in our proceedings, adding value to the work of the competition and regulatory divisions. Having sector-specific and competition know-how has enabled us to carry out analysis in regulated sectors more efficiently. Regarding regulated sectors, the energy sector has always been in our focus because the sector has a monopolistic image and represents a relatively large share of consumer expenditure. An example of such a synergy between the work of Competition Division and Energy Regulatory Division is the recent analysis of the oil shale sector.