In Mumbai electricity is supplied by 3 agencies.  BEST Undertaking covers South Mumbai from Colaba to Mahim/Sion. BSES Ltd, covers North Mumbai from Bandra to Dahisar and Kurla to Vikhroli. The North Eastern  portion comprising of area between Kanjur marg and Mulund is catered to by MSEB.

As  far as BES&T Undertaking is concerned, besides supplying electricity it also caters to local transport to the entire BrihanMumbai region. There are 4 important services offered, these are:-

Giving new connections which also include, augmentation in an existing installation.

Billing and corresponding complaints redressal.

Service for restoration of electric supply in case of interruption.

Installation of street light in megacity area.

For administrative convenience,  the  area of operation is in two zones which is demarcated by a line between Haji Ali , Mumbai Central and Mazgaon, However, the ward areas are practically co-terminus with the municipal ward areas.

The Deputy General Manager (Electric Supply), DGM (ES) is the overall in-charge of the Electric Supply Branch.

The Assistant General Manager (Electric Supply), AGM (ES) is in-charge of Planning, Project, Construction, Street Lighting, Computer Application and the Generation Cell .

Chief Engineer Electric Supply CEES, reports to the DGM(ES) through AGM(ES) and is in-charge of  the street lighting division including the Mega-city project, Material Testing and Standards department, Meters and Relays department and Review committee.

Chief Engineer Distribution CED(N/S) for the North and South zones.

The activities of Commercial, Consumers, Operation and Maintenance departments and Erection are divided into two zones each is under a charge of a Chief Engineer, who is designated as Chief Engineer Distribution (North/South).