According to Comnews, the deal, which is understood to be worth between R1.1 billion (€17.34 million) and R1.6 billion, has been approved by the Federal Antimonopoly Service (FAS).
It adds that Novotelecom, which has operated under the brand name Electronic City since 2003, covers around 92% of the city and two neighbouring towns.
Its services include internet access, IPTV (including HDTV), cable TV (using the brand name ZhirafTV) and telephony.
It has until now been owned by Kriseyl Limited, a company registered in Cyprus.
As a result of the acquisition, ER Telecom will become the leading provider of both broadband access and pay-TV services in Novosibirsk, with market shares of around 40% and 33% respectively.
ER Telecom is one of the leading cable operators in Russia and was particularly active on the M&A front in 2016.