PM Suryaghar BEST Mumbai Process — Step-by-Step 2026

BEST — Brihanmumbai Electric Supply and Transport — is the municipally-owned distribution licensee for South Mumbai island city, covering the strip from Colaba in the south to Mahim and Sion in the north and serving roughly 7.5 lakh consumers. In 2026, BEST consumers apply for the ₹78,000 PM Suryaghar subsidy through the national portal, with BEST handling feasibility approval in 15–22 working days — a slower window than private DISCOMs because BEST runs many internal processes manually as a municipal undertaking. South Mumbai’s 4.8–5.2 peak sun hours, combined with India’s highest residential domestic tariff, push payback in BEST territory to 4.5–5 years for a typical 2 kW rooftop.

This guide walks through every stage of the PM Suryaghar BEST process, the society NOC rules that decide whether a South Mumbai application moves at all, the heritage building constraints under BMC (Brihanmumbai Municipal Corporation) grade I, IIA and IIB lists, and how to track the application from registration to subsidy disbursement.

Direct answer. PM Suryaghar BEST applications follow six stages: portal registration with your BEST Account Number, DISCOM feasibility (15–22 days), vendor selection from the MNRE-empanelled list, society NOC and BMC clearance for heritage roofs, installation, MERC-governed net meter inspection (10–18 days), and Direct Benefit Transfer of the ₹78,000 subsidy within 30 days of commissioning by BEST.

If you’re at the stage of checking your monthly bill header for “BEST” and wondering whether a flat in a 1960s Marine Drive society can actually claim PM Suryaghar — yes, with a clean society NOC and the right roof-rights letter, most BEST applications move through the published timeline. Most delays come from the society resolution stage, not from BEST itself.

BEST Coverage Area: South Mumbai Island City

Mumbai is split across three distribution licensees — BEST covers the island city (South Mumbai), Tata Power covers parts of the western suburbs and the licence area shared with Adani Electricity, and Adani Electricity Mumbai covers the wider suburban belt from Bandra to Mira-Bhayandar and Mulund. The PM Suryaghar process you follow depends entirely on which licensee bills your home.

Zone / Area	DISCOM	Note
Colaba, Cuffe Parade, Navy Nagar	BEST	Cantonment and heritage-heavy district
Fort, Ballard Estate, CSMT precinct	BEST	BMC grade I & IIA buildings — extra approval
Marine Drive, Churchgate, Nariman Point	BEST	Art-deco precinct (UNESCO listed)
Malabar Hill, Walkeshwar, Napean Sea Road	BEST	Highrises; society NOC critical
Tardeo, Grant Road, Mumbai Central	BEST	Mid-rise residential
Worli, Prabhadevi, Lower Parel	BEST	Mill-land redevelopment towers
Dadar, Matunga, Sion, Mahim	BEST	Northern boundary of island city
Bandra, Khar, Santacruz, Andheri	Adani Electricity	Not BEST
Vile Parle, Juhu, Versova (parts)	Tata Power	Not BEST
Mulund, Bhandup, Powai	Adani Electricity	Not BEST

If your monthly bill header reads “Brihanmumbai Electric Supply and Transport Undertaking” or shows the BEST logo with the BMC seal, you’re a BEST consumer and this guide applies. For neighbouring licensees, see our PM Suryaghar Tata Power Mumbai process, and for the wider state context the PM Suryaghar Maharashtra complete guide.

PM Suryaghar Subsidy for BEST Consumers

PM Suryaghar: Muft Bijli Yojana is administered nationally by the Ministry of New and Renewable Energy (MNRE). The central subsidy slabs are fixed nationally — BEST does not set the rate, but BEST’s net meter approval is the trigger that releases the subsidy payment through DBT.

System Size	Central Subsidy (MNRE)	Best for South Mumbai homes
1 kW	₹30,000	1-BHK in Colaba/Fort with monthly bill under ₹1,500
2 kW	₹60,000	2-BHK in Marine Drive/Worli with bill ₹2,000–₹4,000
3 kW	₹78,000	3-BHK on Malabar Hill/Walkeshwar with bill ₹4,000–₹7,500
4 kW and above	₹78,000 (capped)	Penthouse or duplex; extra kW at full cost
Group Housing / RWA	₹18,000 / kW	Common-area loads (lifts, pumps, lobby lighting)

The subsidy arrives via Direct Benefit Transfer (DBT) to the consumer’s Aadhaar-linked bank account within 30 days after BEST commissions the bi-directional net meter. BEST does not handle the money — they sign off the inspection on the PM Suryaghar portal, and the MNRE fund releases the payment.

Real numbers — Walkeshwar 2 kW system. A 2 kW system on a typical Walkeshwar society terrace costs ₹1.30–₹1.45 lakh. After the ₹60,000 subsidy, your out-of-pocket is ₹70,000–₹85,000. The system generates ~270 kWh/month at South Mumbai’s 4.9 PSH. At BEST’s slab-5 tariff of ₹13/kWh territory, monthly savings work out to ₹3,000–₹3,400. Payback: 22–28 months from commissioning for high-consumption homes.

For a full Maharashtra subsidy stack including the state component administered by MEDA, see the PM Suryaghar Maharashtra complete guide — Maharashtra state currently does not add a top-up over the central component, so the ₹78,000 is the ceiling for individual BEST homes.

The 6-Stage BEST PM Suryaghar Funnel

This is the framework we use across our South Mumbai installations — six sequential stages, each with its own dependencies. Skip a stage in BEST territory and you typically lose 3–4 weeks because the society resolution cycle is non-trivial.

Stage 1: Pre-Application Preparation (Day 0–7)

Before you open pmsuryaghar.gov.in, put the following in order. South Mumbai applications need more upfront paperwork than a standalone bungalow in another city.

Locate your BEST Account Number — BEST does not use the “K-number” format that JVVNL uses or the “Consumer No” format some private DISCOMs use. Instead, BEST bills show an Account Number (typically 9 digits) and a Service Number on the top-right of the bill, alongside the BEST logo and BMC seal. You will need both for portal entry.

Check your sanctioned load — printed as “Sanctioned Load” on the bill in kW. Your solar system cannot exceed this figure. A 2-BHK in South Mumbai usually has 3–5 kW sanctioned load, so a 2 kW PM Suryaghar system fits comfortably without a load-enhancement request.

Verify Aadhaar–bank linkage — DBT will only land if the bank account is seeded with the Aadhaar you use on the application. Confirm via UIDAI’s bank-mapper portal.

Confirm the building is not on the BMC heritage grade I list — BMC grade I buildings (Asiatic Society, Rajabai Tower, Bombay High Court area) cannot install rooftop solar at all. Grade IIA and IIB buildings can install with additional Heritage Conservation Committee clearance. Confirm your building’s grade through the BMC heritage list before paying any vendor advance.

Start the society conversation early — most BEST consumers live in MOFA (Maharashtra Ownership of Flats Act) or MahaRERA-registered cooperative housing societies. The society needs to pass a board resolution authorising rooftop installation and granting roof-use rights. This single step adds 10–21 days and is by far the most common cause of South Mumbai PM Suryaghar delays.

Stage 2: Portal Registration & DISCOM Submission (Day 8)

Open the national PM Suryaghar portal, register with your mobile number, and verify the OTP. Once you log in:

1. Select state: Maharashtra.
2. Select DISCOM: BEST Undertaking — Mumbai.
3. Enter your BEST Account Number and Service Number with the bill month.
4. The portal pulls account details from BEST’s database. Verify the name, address, and sanctioned load against your physical bill.
5. Choose your desired system capacity (1, 2, 3 kW or above).
6. Upload Stage 1 documents (see Documents Checklist below).
7. Submit the application — the portal generates an Application Reference Number (ARN).

Save the ARN and screenshot the confirmation. BEST then receives the application in its internal queue for feasibility review at the BEST Undertaking renewable energy desk.

Stage 3: BEST Feasibility Approval (Day 9–30)

BEST’s renewable energy cell at the Wadala headquarters reviews each application against four checks. This stage is slower in BEST territory than in private-DISCOM territory because BEST still runs much of the workflow manually with paper sign-offs across desks.

• Distribution transformer capacity — South Mumbai’s old grid has many transformers running close to load. BEST checks DT loading and may issue a conditional clearance with export capping if the local DT is above 90% loaded.
• Sanctioned load match — proposed system ≤ sanctioned load.
• Heritage / BMC grade verification — for buildings on grade IIA or IIB lists, BEST waits for a parallel Heritage Conservation Committee NOC before clearing feasibility.
• Society resolution and roof-rights letter — BEST specifically checks the society board resolution number and date.

Approval normally takes 15–22 working days. Heritage-grade buildings can take 30–45 days because the Heritage Conservation Committee meets monthly. If BEST asks for additional documents, you have 15 days to respond before the application is auto-closed.

Stage 4: Vendor Selection & Installation (Day 31–55)

After feasibility, the portal shows the list of MNRE-empanelled vendors approved for BEST territory. You choose one — and this is the single decision that determines whether your installation runs smoothly or stalls inside a heritage-precinct corridor.

Heaven Green Energy is MNRE-empanelled for BEST territory and operates a dedicated South Mumbai installation team familiar with society politics, narrow service-lift access in old buildings, and the BMC ward-office workflow. Installation typically takes 2–4 working days for a 2 kW residential system, including structure fabrication, panel mounting, inverter wiring, and earthing — though heritage facades sometimes need custom non-penetrating ballast mounts that add a day.

During installation, the installer must use ALMM-listed panels (Approved List of Models and Manufacturers) and BIS-certified inverters (Bureau of Indian Standards). BEST inspectors are strict on both; any panel not on the ALMM register fails inspection and the subsidy is forfeited.

Stage 5: BEST Net Meter Inspection (Day 56–75)

Once installation is complete, your vendor uploads commissioning documents to the portal — installation photographs, single-line diagram, earth-pit photos, panel and inverter serial numbers, and the society NOC copy. BEST then schedules a physical inspection within 10–18 working days.

The BEST field engineer checks:

• Panel count and model match the application.
• Inverter make, model, and serial number match.
• Earthing is per IS 3043 standard.
• Module mounting structure is corrosion-resistant — a critical check for coastal South Mumbai where salt-laden monsoon air corrodes mild steel within a year.
• AC and DC isolators are correctly placed and labelled per BEST’s safety manual.
• The existing meter is replaced with a BEST-issued bi-directional meter and sealed.

After inspection, BEST commissions the bi-directional meter and issues the commissioning report on the portal. This is the trigger document for subsidy payment.

Stage 6: Subsidy DBT Disbursement (Day 76–105)

Within 30 days of BEST’s commissioning sign-off, the PM Suryaghar fund transfers the subsidy to your bank. You will receive an SMS from PFMS (Public Financial Management System) confirming credit. The bank reference will read “PMSURYAGHAR-DBT”.

If the DBT does not arrive within 30 days, raise a query on the portal quoting your ARN and the BEST commissioning report number. MNRE’s escalation team responds within 7 working days. The most common DBT failure cause in BEST applications is Aadhaar–bank seeding having lapsed between application and commissioning — re-seed at any bank branch and the payment retries automatically.

BEST Documents Checklist

BEST accepts the standard MNRE document set, but the society NOC is non-negotiable for any flat in a cooperative housing society — and that is the document most likely to cause a Stage 3 rejection. Pull this list together before opening the portal.

Document	Format	BEST-specific note
Latest BEST bill (paid)	PDF or image	Within last 3 months; must show “Paid” status and Account Number clearly
Aadhaar card (front + back)	PDF, < 2 MB	Name must match bill name exactly
Cancelled cheque OR bank passbook page	PDF / image	Must show name, IFSC, and account number; account must be Aadhaar-seeded
Property ownership proof	PDF	Sale deed, share certificate (society), or registered leave-and-licence with NOC
Society NOC & board resolution	PDF	On society letterhead, signed by secretary; quote resolution number and date
Roof-rights letter	PDF	Issued by society; specifies which area of terrace is allotted
Heritage Conservation NOC	PDF	Only for BMC grade IIA/IIB buildings — obtained via BMC ward office
Roof photograph	JPG	Daytime, all four corners visible, no wide-angle distortion
Self-declaration form	PDF (portal-generated)	Auto-generated after Stage 2; download, sign, re-upload

For a single-page printable version of this list, see the Suryaghar Mumbai consumer hub.

Get a free BEST document review. Our South Mumbai team reviews society resolutions and BMC heritage status before you submit on the portal — catches the small errors that cause most BEST rejections. Get your free quote →

BEST Net Metering and MERC Tariff

BEST follows the Maharashtra Electricity Regulatory Commission (MERC) framework for net metering. The current rules under the MERC (Distributed Renewable Energy) Regulations, 2024:

• Net metering cap — residential systems up to 10 kW qualify for net metering across MERC area; BEST applies the same cap.
• Sanctioned load constraint — rooftop capacity must not exceed sanctioned load.
• Export tariff — surplus units are credited at the Average Power Purchase Cost (APPC), currently around ₹4.10–₹4.40/kWh per the MERC 2024 tariff order. Lower than retail savings, so self-consumption beats export.
• Billing cycle — net units settled monthly; carry-forward surplus settled annually at APPC.
• Banking — MERC allows banking of surplus within one financial year (April–March settlement).

BEST Domestic Tariff Reference

Slab	Unit range	Energy charge (approx.)
Slab 1	0–100 kWh	₹4.85 / kWh
Slab 2	101–300 kWh	₹7.45 / kWh
Slab 3	301–500 kWh	₹10.85 / kWh
Slab 4	501–700 kWh	₹12.40 / kWh
Slab 5	Above 700 kWh	₹13.05+ / kWh

Source: BEST retail tariff order, MERC 2024 amendment. Wheeling charges, fuel-adjustment charges, and electricity duty are billed on top. South Mumbai’s slab-5 tariff above ₹13/kWh is the highest residential domestic rate in India — which is exactly why even a small 1–2 kW PM Suryaghar system gives competitive payback in BEST territory despite the lower irradiance compared to Rajasthan or Gujarat.

A typical Malabar Hill 3-BHK consuming 800 kWh/month is paying slab-5 rates on the top 100 units. Solar self-consumption strips out the highest-tariff units first, which is what compresses BEST payback to 4.5–5 years.

Common BEST Application Rejection Reasons

Across the residential installations we tracked in BEST territory through 2024–25, rejections cluster around six patterns. These are all preventable with a 15-minute pre-check before opening the portal.

1. 1
   Society NOC missing or in wrong format. BEST requires NOC on society letterhead with the resolution number, date, secretary signature, and society registration number. Generic typed letters from the chairman alone get rejected.
2. 2
   Heritage Conservation NOC not attached. Buildings on BMC grade IIA/IIB lists must attach the Heritage Conservation Committee NOC; BEST flags the address against the BMC heritage register at Stage 3.
3. 3
   Name mismatch between Aadhaar and BEST bill. Even minor variations ("Mehta R." vs "Rajesh Mehta") trigger rejection. Resolve the bill name via BEST's customer-care office in Wadala before applying.
4. 4
   Sanctioned load smaller than proposed system. File a load-enhancement request with BEST first — adds 18–25 days but saves the entire application from rejection at Stage 3.
5. 5
   Roof-rights letter missing. In a society, the NOC authorises installation in principle; the roof-rights letter specifies the exact terrace area allotted. BEST asks for both.
6. 6
   Bank not Aadhaar-seeded. The DBT bounces silently if the bank account is not seeded with the same Aadhaar on the application — and MNRE escalations take 30+ days to resolve.

For the complete taxonomy of rejection causes across DISCOMs and the recovery path for each, read our PM Suryaghar rejection reasons guide.

Cost, ROI, and Payback for South Mumbai Homes

South Mumbai combines moderate solar irradiance (lower than Rajasthan) with the highest residential tariffs in India and the most constrained rooftops in the country. The net result is competitive payback but lower absolute generation per kW than upcountry sites.

System size	All-in cost (Heaven Green)	After ₹ subsidy	Annual generation	Annual savings	Payback
1 kW	₹70,000–₹82,000	₹40,000–₹52,000	1,400 kWh	₹15,000	3–3.5 yrs
2 kW	₹1.30–₹1.45 lakh	₹70,000–₹85,000	2,800 kWh	₹32,000	2.5–3 yrs
3 kW	₹1.85–₹2.05 lakh	₹1.07–₹1.27 lakh	4,200 kWh	₹50,000	2.5–3 yrs
5 kW	₹2.95–₹3.20 lakh	₹2.17–₹2.42 lakh	7,000 kWh	₹78,000	3–3.5 yrs

Assumptions: South Mumbai 4.9 PSH/day average, 72% performance ratio (lower than upcountry due to monsoon and salt deposition), blended tariff of ₹11.30/kWh after slab-mix calculation for typical 600–800 kWh/month consumption, 0.5%/year degradation. For an interactive calculation specific to your BEST bill, use the Heaven Green solar calculator.

Verdict. A 2 kW PM Suryaghar system is the South Mumbai sweet spot. Roofs in BEST territory rarely accommodate more than 3 kW per flat in a society arrangement, BEST’s slab-5 tariff makes self-consumption extraordinarily valuable, and a 2 kW system pays back in 2.5–3 years post-subsidy. Going to 3 kW captures the full ₹78,000 only if your society allots enough terrace area — verify roof rights before sizing up.

Pros and Cons of PM Suryaghar in BEST Territory

For most South Mumbai households whose monthly bill consistently sits above ₹4,000, the pros dominate decisively — the slab-5 tariff is what makes the maths work even with modest roof allocations. Below ₹2,500 monthly bills, the absolute savings shrink and payback drifts to 5+ years, though the subsidy still applies.

How Heaven Green Energy Helps with BEST Mumbai

Heaven Green Energy is MNRE-empanelled across Mumbai and runs a dedicated South Mumbai team that has handled PM Suryaghar applications across Colaba, Marine Drive, Worli, Walkeshwar, and the wider BEST belt. We are India’s #1 ranked PM Suryaghar installer on the national portal, and our team handles the entire BEST workflow end-to-end:

• Society NOC drafting and resolution-meeting support (the single biggest cause of South Mumbai delays).
• BMC heritage list verification and Heritage Conservation Committee NOC liaison for grade IIA/IIB buildings.
• Document pre-check before portal submission — eliminates the top six BEST rejection causes.
• Direct coordination with BEST’s renewable energy desk at the Wadala headquarters for feasibility follow-ups.
• ALMM-listed tier-1 panels (Adani, Waaree, Tata) — never off-list imports.
• BIS-certified inverters with 5–25 year warranties handled directly through us.
• Marine-grade galvanised mounting structures for coastal salt-air durability.
• Net meter coordination with BEST field engineers for faster Stage 5 scheduling.
• 25-year performance support backed by our O&M contracts.

Explore the services that match your project:

• Residential Solar — 1–10 kW rooftop systems with PM Suryaghar subsidy handled end-to-end across BEST territory.
• Solar Calculator — see your subsidy and savings for your BEST bill in 60 seconds.
• Contact our Mumbai team — South Mumbai-based engineers for site visits across Colaba to Mahim.

For the national portal walkthrough with screenshots, see our PM Suryaghar complete guide. For neighbouring suburban licensees, see the PM Suryaghar Adani Electricity guide covering Bandra to Mira-Bhayandar.

Frequently Asked Questions

How long does the BEST PM Suryaghar process take from application to subsidy?

The complete timeline from portal submission to subsidy DBT runs 75–105 days for a clean BEST application — slower than private DISCOMs because BEST runs much of the workflow manually as a municipal undertaking. Feasibility approval takes 15–22 working days, society resolution and NOC 10–21 days (often parallel), installation 3–5 days, BEST net meter inspection 10–18 days, and DBT disbursement up to 30 days after commissioning. Heritage-grade IIA/IIB buildings add another 15–30 days for the BMC Heritage Conservation Committee NOC.

What is the maximum subsidy a BEST consumer can claim under PM Suryaghar?

The maximum central subsidy is ₹78,000 for any system 3 kW or larger. Smaller systems get ₹30,000 for 1 kW and ₹60,000 for 2 kW. Group housing societies installing solar for common-area loads such as lifts, pumps, and lobby lighting get ₹18,000 per kW with a cap based on the total dwelling count. These rates are fixed by MNRE nationally and do not vary by DISCOM — BEST consumers get exactly the same central subsidy as anyone else in India.

Can I install PM Suryaghar solar on a heritage building in South Mumbai?

It depends on the BMC heritage grade. Grade I buildings (the most strictly protected — Asiatic Society, Bombay High Court, Rajabai Tower) cannot install rooftop solar at all. Grade IIA and IIB buildings can install with a Heritage Conservation Committee NOC from the BMC, typically obtained via the ward office in 30–45 days. Buildings with no heritage listing follow the standard BEST PM Suryaghar process. Always verify your building’s grade through the BMC heritage register before paying any vendor advance.

Do I need society NOC for PM Suryaghar in a BEST cooperative housing society?

Yes — and it is the single most common cause of BEST application delays. The NOC must be on society letterhead, quote the board resolution number and date, carry the secretary’s signature, and include the society registration number. You also need a separate roof-rights letter specifying the exact terrace area allotted to your flat. Generic typed letters from the chairman alone get rejected. Heaven Green’s Mumbai team drafts the resolution and supports the society meeting to avoid the typical 3–4 week back-and-forth.

What is the BEST Account Number and where do I find it?

BEST does not use the “K-number” format that some other Indian DISCOMs use. Instead, every BEST bill carries an Account Number (usually 9 digits) and a Service Number printed on the top-right of the monthly bill alongside the BEST logo and BMC seal. Both are required when registering on the PM Suryaghar portal. If you cannot locate them, BEST’s customer-care office in Wadala or the local ward office can reprint the bill with both numbers highlighted.

Does BEST pay for surplus solar units exported to the grid?

Yes, but at the MERC-approved Average Power Purchase Cost (APPC) — currently ₹4.10–₹4.40 per kWh under the MERC 2024 tariff order — not the retail tariff. Self-consumption at South Mumbai’s slab-5 rate of ₹13+ per kWh is worth roughly three times more than export. Your system should be sized to match daytime consumption, not maximised for export. Annual surplus is settled at APPC in March; unused banked units do not carry forward to the next financial year.

Why does BEST feasibility take longer than Adani Electricity or Tata Power in Mumbai?

BEST is a municipal undertaking owned by the BMC and runs many internal processes manually with paper sign-offs across desks at the Wadala headquarters. Adani Electricity and Tata Power are private DISCOMs with fully digitised workflows that automate the feasibility check against the transformer database. The practical impact is 5–7 extra working days for feasibility approval. The subsidy amount and net metering rules are identical across all three Mumbai licensees because they all follow MERC and MNRE.

Is PM Suryaghar subsidy applicable for solar systems with battery storage in BEST territory?

The central PM Suryaghar subsidy applies only to the grid-connected solar PV portion of the system — batteries are not subsidised under this scheme. You can still install a battery-backed hybrid system in BEST territory; the solar capacity claims the ₹78,000 subsidy as normal, and you fund the battery separately. Most South Mumbai households go grid-tied without batteries because the BEST grid is among India’s most reliable, with average outages under 30 minutes a year. Battery payback adds 3–4 years to the ROI, so we only recommend hybrid systems for clients with critical medical or work-from-home loads.