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Mumbai Solar Calculator (Adani Electricity)

Rooftop solar payback for Mumbai's western suburbs on Adani Electricity, with the wheeling charge, 16% duty and the society subsidy.

Updated · By Niraj Kumar · 1 source

Your home

Solar forSolar for
From your bill, enterFrom your bill, enter
₹
₹100₹50K

About 325 units a month on the Adani Electricity tariff. Use a year's average if your bill swings with the seasons.

Roof typeRoof type

Fine-tune

kW

Sized to cover a year of your consumption, at 5.4 peak sun hours a day in Maharashtra.

sq ft

About 100 sq ft per kW. Leave at 0 for no limit.

₹

Typical for an on-grid system from an empanelled vendor. Replace it with your quote.

%
0%15%

Indian residential tariffs have historically risen 4-7% a year.

%
0%2%

Monocrystalline panels typically lose about 0.5% a year.

How you payHow you pay
Pays for itself in2.3 yearsthen ₹14.25 L ahead after 25 years

A 2.5 kW system makes about 316 units a month, 97% of your use. Your bill drops from ₹3,000 to about ₹158 in year one.

Installed cost
₹1,50,000
PM Surya Ghar subsidy
− ₹69,000
Net cost to you
₹81,000
Saving in year one
₹34,148
Return (IRR)
46.5% a year
over 25 years, before tax
CO₂ avoided
64 tonnes
over 25 years
Subsidy46%
  • You pay54%
  • Central subsidy46%
Your money over 25 yearsStill to recoverAhead
₹-5 L₹0₹5 L₹10 L₹15 LPayback, year 2.304812162025
Year-by-year cash flowShow
YearUnits madeBills without solarBills with solarUpkeep and EMIsRunning total
13,794₹36,044₹1,896₹0-₹46,852
23,775₹37,846₹2,112₹0-₹11,118
33,756₹39,738₹2,344₹0₹26,276
43,738₹41,725₹2,593₹0₹65,408
53,719₹43,812₹2,861₹0₹1,06,359
63,700₹46,002₹3,149₹1,500₹1,47,712
73,682₹48,302₹3,457₹1,500₹1,91,058
83,663₹50,717₹3,787₹1,500₹2,36,488
93,645₹53,253₹4,141₹1,500₹2,84,101
103,627₹55,916₹4,520₹1,500₹3,33,997
113,609₹58,712₹4,925₹1,500₹3,86,283
123,591₹61,647₹5,359₹19,000₹4,23,572
133,573₹64,730₹5,823₹1,500₹4,80,978
143,555₹67,966₹6,319₹1,500₹5,41,125
153,537₹71,364₹6,849₹1,500₹6,04,141
163,519₹74,933₹7,415₹1,500₹6,70,159
173,502₹78,679₹8,019₹1,500₹7,39,320
183,484₹82,613₹8,664₹1,500₹8,11,769
193,467₹86,744₹9,352₹1,500₹8,87,661
203,449₹91,081₹10,086₹1,500₹9,67,156
213,432₹95,635₹10,868₹1,500₹10,50,423
223,415₹1,00,417₹11,702₹1,500₹11,37,638
233,398₹1,05,438₹12,591₹1,500₹12,28,984
243,381₹1,10,710₹13,538₹1,500₹13,24,656
253,364₹1,16,245₹14,546₹1,500₹14,24,855

How the Mumbai Solar Calculator (Adani Electricity) works

Saving₍y₎ = [Bill(U) − Bill(U − G₍y₎/12)] × 12 × (1 + e)^(y−1), G₍y₎ = kW × H × 365 × PR × (1 − d)^(y−1)

This page uses the same method as the Solar ROI Calculator India, which explains each term and assumption in full.

Worked example

A Mumbai home on Adani Electricity with a ₹3,500 monthly bill and a flat RCC roof, assuming prices rise 5% a year.

  1. 1Working the bill back through the Adani Electricity slabs, charges and duty gives about 369 units a month
  2. 2At 5.4 peak sun hours, 3 kW makes about 379 units a month, 100% of that use
  3. 33 kW at ₹60,000 per kW costs ₹1,80,000; PM Surya Ghar pays ₹78,000, leaving ₹1,02,000
  4. 4The first year saves ₹41,089, and the saving grows as tariffs rise

The system pays for itself in about 2.4 years and leaves the household about ₹17,27,804 ahead over 25 years.

Frequently asked questions

Can a flat in a Mumbai building install rooftop solar?

Rarely on its own: the terrace belongs to the society, and a high-rise roof is small for the number of flats. Most Mumbai installations are society systems for common areas such as lifts, pumps and lighting, which get ₹18,000 a kW from PM Surya Ghar. The housing society solar calculator works those out per flat.

Does solar cut the wheeling charge on an Adani Electricity bill?

Yes. Under net metering the wheeling charge, about ₹2.28 a unit, is levied on the net units you draw from the grid, so each unit solar offsets saves its energy charge, wheeling and 16% duty together.

How does net metering settle on Adani Electricity?

Surplus units are banked month to month and settled once a year at the MERC-approved rate. MERC has confirmed that residential net metering continues under the new ToD meters, with banked units usable at any hour.

Sources

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