The Law Office advises a proprietor of an apartment house in Osokorky area of Kyiv in the lawsuit initiated by PJSC “Kyivenergo” in respect recovery of payment for proprietor’s electric hardware connection to external electric system. “Kyivenergo” has brought a legal action against the building owner for recovery of payment for joining to the electric system, proceeding from predicted capacity of the customer’s electric hardware specified by specifications, instead of from actual capacity of the hardware connected on technical decision.The disputable claim exceeds UAH 150 000,00. The lawsuit is being authorized by civil court of Shevchenkivsky district of Kiev. The legal analysis of the agreement and relations between the building owner and the electro supplying company at joining to electric systems is performed, the conclusion about judicial prospect of lawsuit is given, the legal position of protection in the case is developed, and also legal advice on pre-judicial dispute settlement is given.