From 2000 to 2009, General Director of OJSK AK Yakutskenergo and the Deputy Chairperson of the Trustees Councils of Educational Institutions of the Republic of Sakha (Yakutia).

In 1994, he graduated from the Academy of National Economy under the Government of the Russian Federation, receiving the qualification of a manager of the highest category.

[6] With the direct participation of Ilkovsky, significant projects of the Yakut energy system were implemented and began to be implemented - an optimization program of local energy, an increase in the share of centralized electricity and heat supply, the construction of a high-voltage 220 kV Suntar-Olekminsk line to provide power supply for VS-TO.

He was also a member of the inter-factional group “Baikal”, which was formed of MPS from the Zabaykalsky Krai, Buryatia and the Irkutsk Region.

He left the State Duma before his mandate termination, after his appointment on March 1, 2013, as interim governor of the Zabaykalsky Krai.

Since March 1, 2013, the Acting Governor of the Zabaykalsky Krai has been appointed by decree of the President of the Russian Federation Vladimir Putin.

[12] The governorship of Konstantin Ilkovsky was marked by a number of scandals: the region is in a pre-bankrupt state, the regional budget deficit of 5.5 billion rubles, public sector employees wages are regularly delayed, 115 thousand hectares of land in the Zabaykalsky Krai planned to transfer for 49 years years old for rent to a Chinese Company.

February 17, 2016, Russian President Vladimir Putin accepted the resignation of Konstantin Ilkovsky upon his own request.

The resignation of the governor was associated with poor financial discipline, as well as due to the failure of the region to fulfill its obligations to resettle citizens from emergency housing.