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Project analysis

Illustrative case — not actual project data. Edit any fact.

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Mumbai · MERC MYT Order, Case No. 210 of 2024 · FY 2026-27 figures5 of 10 rates are placeholders

The open-access sheet labels its columns “FY25-26, FY25-27, FY25-28…”. These appear to be typos; the second column is used as FY 2026-27.

Annual consumption

6.21 GWh

Annual electricity bill

₹7.84 Cr

Per flat / month

1174 kWh

Common areas / year

570 MWh

Recommended structure

Conditional

Group Captive Solar (off-site)

Society owns ≥26% of an off-site plant and wheels power to members.

Capacity
3.69 MW
Investment
₹15.49 Cr
Annual savings
₹5.23 Cr
Payback
3.0 yrs

Conditional: Electricity (Amendment) Rules, 2026 — legal review must be resolved before this recommendation is relied on.

All structures, ranked

#StructureEligibilityCoverageSavings / yrScore
1

Group Captive Solar (off-site)

Conditional90.0%₹5.23 Cr
66
2

Virtual Net Metering

Conditional90.0%₹5.23 Cr
40
3

Rooftop Net Metering (common areas)

Permissible2.6%₹19.9 L
37
4

RESCO Rooftop (zero capex)

Conditional2.6%₹11.9 L
13
5

Third-party Green Open Access

Conditional8.3%₹18.7 L
2

Eligibility & compliance tests

Group Captive Solar (off-site)

  • Legal status of the society

    Registered cooperative society — ownership and consumption tests are satisfied collectively by members.

  • Captive ownership ≥ 26%

    Captive users hold 30% of the plant (holdings of subsidiaries and holding companies in one corporate group may be aggregated).

  • Captive consumption ≥ 51% of generation (percentage unverified)

    Members would consume 100% of generation during the financial year. If this test fails, the whole year's generation is treated as non-captive.

  • Green energy open access load threshold

    Captive consumers are not subject to the 100 kW load limit.

  • Plant location and transmission route

    Plant in Maharashtra — intra-state open access; captive verification by the state-designated nodal agency.

  • Electricity (Amendment) Rules, 2026 — legal review

    Substituted Rule 3 is applied, but its library entries await legal review and the consumption-test percentage is unverified.

Risk analysis

  • If the consumption test fails for the year, the entire generation is treated as supply by a generating company and cross-subsidy and additional surcharge are levied.
  • Surcharges are not levied while verification is pending on a declaration — but if verification then fails they are payable with carrying cost.
  • Surplus generation above members' consumption earns nothing in this model.
  • Banking terms and time-of-day mismatch can reduce usable energy.

Charges per unit

Avoided licensee tariff₹12.64

Wheeling charge

−₹2.40

Transmission & banking charges

−₹0.60

Cross-subsidy surcharge

Not levied on captive use

−₹0.00

Additional surcharge

Not levied on captive use

−₹0.00
Net value per kWh₹9.64
Generation / yr
5.72 GWh
Used by consumers
5.58 GWh
Network losses applied
2.29%

Approval sequence

  1. 1

    General body resolution approving investment and structure

    Society / Registrar of Cooperative Societies

  2. 2

    Acquire ≥26% ownership in the generating plant

    Society & developer

  3. 3

    Connectivity for the generating plant

    STU / licensee

  4. 4

    Green energy open access application

    Designated GEOA portal / nodal agency

  5. 5

    Energy accounting & metering at each drawal point

    Licensee / MSLDC

  6. 6

    Annual captive declaration and status verification

    State-designated nodal agency

Automatic compliance checklist

  • Society registration certificate and bye-laws
  • General body resolution authorising the project
  • Latest 12 months of electricity bills (all connections)
  • Sanctioned load / contract demand for each connection
  • Tata Power Mumbai consumer numbers for all connections
  • Shareholding pattern of the generating company (≥26%)
  • Annual consumption projection showing ≥51% captive use
  • Gazette text of Electricity (Amendment) Rules, 2026 for re-testing

Decision support only. Ambiguous or high-risk interpretations require review by a qualified legal professional.