Electricity Supply Companies in Mumbai: Who Supplies Where, and What It Means for Your Wiring

Electricity supply companies in Mumbai: the short answer

Four electricity supply companies serve Mumbai. BEST supplies the island city, from Colaba up to Mahim and Sion. Adani Electricity Mumbai (AEML) holds the licence for the suburbs from Bandra to Dahisar, Chunabhatti to Vikhroli and Mankhurd, plus Mira Bhayandar. Tata Power holds a second, parallel licence over the city, much of the suburbs and Mira Bhayandar, so it competes with both. MSEDCL, known as Mahavitaran, supplies Mulund and Bhandup, and Thane and Navi Mumbai beyond the city.

Which one you get decides who fits your meter, who sanctions your load and whom you call in a power cut. It does not change the wiring inside your flat. That part is yours, and it is where we come in: we make the MCBs, isolators, MCB boxes and switches that sit after the meter, at our works in Marol, Andheri East.

Below: which company covers which area, single phase or three phase, sanctioned load, where the meter goes in a Mumbai building, and what to tell your electrician about the main switch and DB.

Which company supplies electricity in my area of Mumbai?

Your area decides it. Find your suburb on the sketch, then confirm against your last bill, because the company name and consumer number are printed at the top.

Mumbai electricity supply areas, approximate

Drawn by us from the published licence descriptions; not to scale and not a boundary map. Tata Power’s licence covers the whole Mumbai district, part of the suburban district and Mira Bhayandar, and its network does not reach every street inside it. Tap the diagram to open it full size.

Island city Colaba, Fort, Worli, Parel, Dadar, Mahim and Sion: BEST, or Tata Power where its network reaches. Western suburbs Bandra to Dahisar, including Andheri, Goregaon, Malad and Borivali: AEML or Tata Power. Eastern suburbs Chunabhatti, Kurla and Ghatkopar up to Vikhroli, and Mankhurd: AEML or Tata Power. Mulund and Bhandup: MSEDCL. Mira Bhayandar: AEML or Tata Power.

Two supply companies on one street: parallel licences

In large parts of Mumbai, two licensed companies may supply the same building. Tata Power’s distribution licence, granted by the Maharashtra Electricity Regulatory Commission (MERC) in August 2014 and running to August 2039, overlaps BEST’s area in the island city and AEML’s area in the suburbs.

In practice, a flat in Wadala or Andheri may be on BEST or AEML while the flat upstairs is on Tata Power. Each company runs its own meter and own service cable, and a redevelopment tower may find that one company can give it a connection sooner than the other, often because of where a substation can be built.

More changes are on the table. In June 2025 MSEDCL applied to MERC for a parallel licence across most of Mumbai; an Adani company (2022) and Torrent Power have applied for licences that cover Mulund and Bhandup; Tata Power filed its own application for a wider area in 2025; and AEML has asked to supply Dharavi as it is redeveloped. MERC’s public notices of 23 June 2025 found the Adani and Torrent applicants prima facie eligible, but we found no final order on any of these as of October 2026.

How big is each Mumbai power company?

Of the three that publish Mumbai figures, AEML is the largest by consumers, BEST next, then Tata Power. The numbers below come from different reports and dates, so read them as orders of size, not a league table.

Size does not change anything at your switch board. What matters is the supply type the company gives you, the sanctioned load it agrees to, and where it puts the meter. All four follow the same MERC Supply Code 2021, so the rules below apply whichever name is on your bill.

Where the supply company stops and your wiring starts

The supply company’s job ends at the point of supply: the outgoing terminals of its cut-out or switchgear fixed in your premises, which in a Mumbai building usually means the meter cabin. Everything after that point is your wiring.

The Supply Code says so plainly: wiring beyond the point of supply is carried out by the consumer and must meet the Central Electricity Authority’s safety regulations. A new connection application asks for the name and licence number of the Licensed Electrical Contractor who will certify that wiring.

So the meter, the service cable and the company’s cut-out belong to the supply company. The sub-main cable up to your flat, your main switch, your DB, every circuit, switch and socket belong to you. Where the building has a bus riser to meters on upper floors, the riser itself is handed over to the supply company. If the supply company finds leakage in your internal wiring that is harmful to you, other consumers or its network, it may disconnect you, giving its reasons.

Single phase or three phase: what the supply company will give you

Under Mumbai’s Supply Code, a general supply up to 40 amperes is single phase, two wires at 230 to 240 V. Above that, low-voltage supply is three phase, 400 to 415 V between phases, up to a sanctioned load of 160 kW or 200 kVA. Bigger loads move to 11 kV and above.

For most flats that means single phase: one phase and neutral, a double pole main, and an SPN DB. A bungalow, a large duplex, or a home with several ACs and an EV charger may need three phase, which brings a four pole main and a TPN DB.

The code also lets a consumer who qualifies for single phase ask for three phase if it is technically feasible and the consumer bears the required expense. Our single phase vs three phase guide weighs when that is worth it; here the point is simply that the supply company decides what it can give, and your DB must match it.

Sanctioned load: the number your supply company agrees to

Sanctioned load is the load, in kW or kVA, that the supply company has agreed to supply to your premises. You state it when you apply, the company sanctions it, and it decides your supply type and, with your wiring, your main switch.

The new connection form asks for the total load applied for, in kW, and lists the use of each part of it. Our electrical load calculation guide adds it up for a 2BHK. As a rough feel: a 5 kW single-phase load draws about 22 A at 230 V (5,000 ÷ 230), comfortably inside the 40 A single-phase limit.

If you add a second AC, a geyser or an EV charger, apply for additional load through the same application route. Your bill is a separate matter; see how to calculate an electricity bill.

Where the meter goes in a Mumbai building

In a multi-storey building the supply company places meters at ground floor, in an accessible spot, at a height where they can be read and protected from weather. A meter on another floor needs a bus riser that the consumer pays for and then hands over to the company.

That is why most Mumbai flats have a meter room in the stilt or ground floor and a long sub-main running up the duct to the flat. On the 14th floor of an Andheri tower that run can be tens of metres, and every metre adds a little voltage drop. Your electrician sizes that cable for the load and the distance, not by habit.

Two practical things follow. First, put your main switch and DB just inside the flat entrance, so you can switch off without going down to the meter room. Second, make sure your meter and your own sub-main switch in the meter room are labelled with your flat number; ask the society or the supply company to label the meter if it is not. In a monsoon fault at 2 a.m., nobody should be guessing which of forty meters is yours.

What to tell your electrician: main switch and DB

Tell your electrician your supply type, sanctioned load and supply company. Supply type sets a double pole or four pole main and an SPN or TPN DB; your electrician then picks the main MCB rating from the real load and the sub-main cable.

For a single-phase flat, a double pole MCB as the main: our 411 for 6 to 32 A or 412 for 40 A, made under IS/IEC 60898-1, CM/L-2544151. An MCB carries its rated current indefinitely and trips on sustained overload above it or at once on a short circuit. For three phase, a four pole MCB, the 432 at 40 A or 433 at 63 A; our 3 pole vs 4 pole MCB guide explains why four.

The board: an SPN white line box from MRP ₹380 (371, 2–4 way) to MRP ₹950 (374, 16–18 way), or a TPN double door from MRP ₹2,620 (387, 4 way). See SPN vs TPN distribution board.

After the main switch: circuits, wire and earth leakage

Behind the main switch, each circuit gets its own MCB, and each MCB is chosen to protect its wire: the MCB rating must not exceed what the cable can carry.

Our 401 single pole MCB, 6 to 32 A, is MRP ₹145. Never put a 16 A socket on a 20 A MCB with 1.5 sq mm wire: the wire overheats before the MCB acts. Our MCB size calculation guide works through the numbers.

Add a 30 mA RCCB for bathrooms, balconies, outdoor circuits or the whole house. We do not make RCCBs, so buy a BIS-marked one from a brand that does and leave room for it in the DB.

Moving flat or changing supplier: what changes in your wiring

Very little inside the flat. If you move from one Mumbai supply company to another where both are licensed, the meter and service cable change; your DB, MCBs and circuits stay as they are. If you move house, the new flat comes with its own connection, so check its main switch and DB before you move in.

The supplier changes meter and consumer number, and its helpline becomes the one you call. The terms of switching between companies in Mumbai are set by MERC; ask the company you want to move to for its current process in writing.

A change is still a good moment to ask your electrician to check the main switch rating, the sub-main up from the meter room and the earthing. If an old flat still has a kit kat fuse as the main, that is the time to fit a double pole MCB. Our which MCB for home page covers the choice.

Power cut or tripping? Who to call

If the whole building is dark, call your supply company. If only your flat is off, check your own main switch and DB first, then call an electrician.

Whole street dark or a meter burning: the supply company’s helpline printed on your bill. Only your flat off: look at your main MCB. If it has tripped, switch off the circuit MCBs, reset the main, then turn circuits on one at a time to find the faulty one. One circuit keeps tripping: see MCB tripping again and again or, for an RCCB, RCCB tripping.

Our works are in Marol, Andheri East, inside the Bandra to Dahisar stretch, and we supply dealers across Mumbai and India. For our local dealer network see Andheri, Bandra and Borivali.