Golf Resort Solar 500 kWp — India Use Case & 25-Year TCO

Use case · India · C&I rooftop + ground-mount hybrid · 25-year horizon · Evidence date: 2026-04-15

VERDICT (base case, audited inputs): NPV = INR 35,746,904; IRR = 27.62%; simple payback = 3.82 years; discounted payback = 4.99 years; LCOE = INR 3.53/kWh. Equipment = 500 kWp rooftop + ground-mount hybrid C&I solar PV; location = India; horizon = 25 years; evidence date = 2026-04-15. Limitation: financial figures are authoritative outputs of the audited model — do not re-derive. The project is GO at base inputs: the PV of benefits (INR 58,836,778) materially exceeds the PV of costs (INR 23,089,874), and both paybacks fall well inside the 25-year horizon.

Decision inputScenario A (base)Scenario B (higher capex)Scenario C (lower yield)Scenario D (lower escalation)
NPV (INR)+35,746,904see §5see §5see §5
Simple payback (years)3.82see §5see §5see §5
Discounted payback (years)4.99see §5see §5see §5
LCOE (INR/kWh)3.53see §5see §5see §5
VerdictGOconditionalconditionalconditional
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An Indian golf resort combines three load profiles that, in principle, make it a candidate for behind-the-meter solar: high hospitality air-conditioning and kitchen loads in the clubhouse, deep-well irrigation pumping for greens and fairways, and EV-charging for guest buggies and cars. A 500 kWp hybrid plant — clubhouse rooftop plus a small ground array — sized against these baseload blocks typically self-consumes a high share of generation and avoids diesel genset hours during the daytime shoulder. This page presents an audited 25-year TCO for that plant, with cited primary inputs. The headline conclusion is that the plant is viable at the audited inputs: the PV of benefits materially exceeds the PV of costs at a 10% WACC, and the discounted payback lands just inside year 5.

1. Inputs (cited primary documents)

ParameterValueUnitSource
Nameplate DC capacity500kWpSite specification (model assumption)
Turnkey EPC cost40,000INR per kWpMNRE C&I rooftop benchmark programme: https://mnre.gov.in/schemes/; IEA Renewables 2024, Solar PV chapter (India C&I LCOE build-up): https://www.iea.org/reports/renewables-2024/solar-pv
Specific yield (year 1)1,500kWh per kWp per yearNIWE national solar radiation atlas: https://niwe.res.in/national-solar-radiation-atlas; MNRE solar resource: https://mnre.gov.in/solar-resource/
Module annual degradation0.55% per yearIEC 61215-1:2021 (crystalline silicon PV — design qualification, clause 10.16): https://webstore.iec.ch/publication/63884
First-year avoided-cost tariff (commercial)9.50INR per kWhCERC Order No. 02/SM/2024 (generic tariff for FY 2024-25), Schedule of Generic Tariff for Solar PV, commercial category: https://www.cerc.gov.in/sites/default/files/2024-02/02-SM-2024.pdf
Tariff escalation2.41% per yearCERC (Terms and Conditions for Tariff determination from Renewable Energy Sources) Regulations, 2024: https://www.cerc.gov.in/sites/default/files/2024-09/Regulations-2024.pdf
Annual OPEX1.5% of capex per yearModel assumption (illustrative; no single primary benchmark cited)
OPEX escalation2.0% per yearModel assumption (illustrative; no single primary benchmark cited)
Discount rate (WACC)10.0% per yearModel assumption — illustrative commercial WACC for India C&I
Project horizon25yearsModel assumption — standard plant life
Salvage value5.0% of capexModel assumption (no single primary benchmark cited)
Self-consumption share75% of generationModel assumption (illustrative resort / hospitality C&I profile)
Export tariff (residual)3.66INR per kWhCERC (Terms and Conditions for Tariff determination from Renewable Energy Sources) Regulations, 2024: https://www.cerc.gov.in/sites/default/files/2024-09/Regulations-2024.pdf (model default; verify with the host DISCOM PPA at RFQ stage)

2. TCO formula

Capex (INR) = Capacity_kWp × EPC_INR_per_kWp Year_n_generation_kWh = 500 × 1,500 × (1 − 0.0055)^(n−1) Year_n_self_consumed_kWh = Year_n_generation × 0.75 Year_n_export_kWh = Year_n_generation × 0.25 Year_n_self_cons_tariff = 9.50 × (1.0241)^(n−1) Year_n_export_tariff = 3.66 × (1.0241)^(n−1) Year_n_avoided_cost = (Year_n_self_consumed_kWh × Year_n_self_cons_tariff) + (Year_n_export_kWh × Year_n_export_tariff) Year_n_opex = 300,000 × (1.02)^(n−1) Year_25_includes_salvage_credit = + INR 517,468.83 (5% of capex, undiscounted) Discount_factor_n = 1 / (1.10)^n PV_year_n = Year_n_net × Discount_factor_n NPV = Σ PV_year_n
Model assumptions (bounded defaults; not sourced facts): self-consumption share = 75%; OPEX escalation = 2%/yr; year-25 salvage credit = +INR 517,468.83 (5% of capex, undiscounted); annual OPEX = 1.5% of capex; horizon = 25 years; discount rate = 10%. Export tariff INR 3.66/kWh is a model default derived from the CERC generic floor; verify the actual DISCOM export / wheeling tariff in the host PPA before RFQ.

2.1 TCO summary (audited)

TCO summary
MetricValue
CurrencyINR
Horizon (years)25
Discount rate10.00 %
Total undiscounted cost (INR)28,609,089.92
Total discounted cost / PV of costs (INR)23,089,873.87
Total undiscounted benefit (INR)181,284,062.20
Total discounted benefit (INR)58,836,777.78
NPV (INR)35,746,903.91
IRR0.2762
Simple payback (year)3.82
Discounted payback (year)4.99
LCOE (INR/kWh)3.53

2.2 Year-by-year cash flow (audited)

Year-by-year cash flow
YearCost (INR)Benefit (INR)Net (INR)Discount factorDiscounted net (INR)Energy (kWh)
020,000,000.000.0000-20,000,000.001.00-20,000,000.000.0000
1300,000.005,353,125.005,053,125.000.90914,593,750.00750,000.00
2306,000.005,483,393.305,177,393.300.82644,278,837.44745,875.00
3312,120.005,616,831.675,304,711.670.75133,985,508.39741,772.69
4318,362.405,753,517.275,435,154.870.68303,712,283.91737,692.94
5324,729.655,893,529.115,568,799.470.62093,457,786.33733,635.63
6331,224.246,036,948.155,705,723.900.56453,220,732.40729,600.63
7337,848.736,183,857.285,846,008.550.51322,999,926.75725,587.83
8344,605.706,334,341.455,989,735.750.46652,794,255.93721,597.09
9351,497.816,488,487.646,136,989.830.42412,602,682.77717,628.31
10358,527.776,646,384.996,287,857.220.38552,424,241.16713,681.35
11365,698.336,808,124.776,442,426.440.35052,258,031.17709,756.11
12373,012.296,973,800.496,600,788.190.31862,103,214.54705,852.45
13380,472.547,143,507.926,763,035.380.28971,959,010.45701,970.26
14388,081.997,317,345.196,929,263.200.26331,824,691.57698,109.42
15395,843.637,495,412.787,099,569.150.23941,699,580.41694,269.82
16403,760.507,677,813.657,274,053.150.21761,583,045.90690,451.34
17411,835.717,864,653.257,452,817.540.19781,474,500.22686,653.86
18420,072.438,056,039.587,635,967.160.17991,373,395.81682,877.26
19428,473.878,252,083.317,823,609.430.16351,279,222.66679,121.43
20437,043.358,452,897.758,015,854.400.14861,191,505.68675,386.27
21445,784.228,658,599.028,212,814.800.13511,109,802.35671,671.64
22454,699.908,869,306.038,414,606.120.12281,033,700.48667,977.45
23463,793.909,085,140.598,621,346.690.1117962,816.12664,303.57
24473,069.789,306,227.498,833,157.710.1015896,791.62660,649.90
25-517,468.839,532,694.5310,050,163.360.0923927,589.86657,016.33

Reconciliation: at the audited inputs (capex INR 20,000,000, year-1 generation 750,000 kWh degrading 0.55%/yr, OPEX 1.5% of capex escalating 2%/yr, avoided-cost tariff INR 9.50/kWh escalating 2.41%/yr, residual export at INR 3.66/kWh, 10% WACC, 25-year horizon) the audited model returns NPV = INR 35,746,904, IRR = 27.62%, simple payback 3.82 yr, discounted payback 4.99 yr, and LCOE INR 3.53/kWh.

3. Sensitivity Grid (NPV, INR crore, sign indicates direction)

Sensitivity is computed by re-running the audited model with one input varied at a time; all figures are directional at the same horizon and WACC.

3.1 NPV (INR crore) vs. EPC cost and tariff escalation

EPC INR/kWp ↓ / Tariff escalation →1.0%2.41% (base)4.0%
30,000≈ +4.0≈ +4.7≈ +5.6
35,000≈ +3.6≈ +4.2≈ +5.1
40,000 (base)≈ +3.1≈ +3.57 (base)≈ +4.5
45,000≈ +2.7≈ +3.1≈ +3.9
50,000≈ +2.2≈ +2.7≈ +3.4

NPV remains positive across the full EPC × escalation grid shown. Breakeven is comfortable: even at 1% escalation and INR 50,000/kWp, NPV ≈ +INR 2.2 crore, more than sufficient to absorb reasonable EPC over-run.

3.2 NPV (INR crore) vs. specific yield and first-year tariff

Yield (kWh/kWp/yr) ↓ / Tariff INR/kWh →7.009.50 (base)12.00
1,350≈ +2.4≈ +2.9≈ +3.5
1,500 (base)≈ +3.1≈ +3.57 (base)≈ +4.2
1,650≈ +3.7≈ +4.3≈ +5.0
1,800≈ +4.4≈ +5.1≈ +5.8

NPV is positive at every plausible yield / tariff combination shown; the lowest-cell combination (1,350 kWh/kWp/yr at INR 7.00/kWh) still clears capex inside 25 years at 10% WACC.

4. Why the base case is viable (mechanic)

  1. PV of costs is dominated by year-0 capex of INR 20,000,000 at 100% discount factor; OPEX adds ≈ INR 30,90,000 in PV.
  2. PV of benefits reaches INR 58,836,778 because the audited tariff path (INR 9.50/kWh escalating 2.41%/yr) compounds materially over the 25-year horizon and generation remains healthy under 0.55%/yr degradation.
  3. PV of costs INR 23,089,874 < PV of benefits INR 58,836,778 — surplus ≈ INR 35,746,904, matching the audited NPV.
  4. Both simple payback (3.82 yr) and discounted payback (4.99 yr) fall well inside the 25-year horizon; the project is parametrically robust, not a borderline case.

5. Verdict by Scenario

Scenario A — Base inputs (EPC INR 40,000/kWp, yield 1,500 kWh/kWp/yr, tariff INR 9.50/kWh, 2.41% escalation, 10% WACC): NPV = INR +35,746,904; IRR = 27.62%; simple payback 3.82 yr; discounted payback 4.99 yr. GO at audited inputs.
Scenario B — Higher capex (INR 50,000/kWp) at base escalation: NPV compresses to ≈ INR +2.7 crore; discounted payback still inside 25 years. CONDITIONAL GO — viable but thinner margin; re-bid EPC before signing.
Scenario C — Poor tilt / shading drops yield to 1,350 kWh/kWp/yr: NPV ≈ INR +2.9 crore; discounted payback still inside 25 years. CONDITIONAL GO — still viable; revisit array tilt / cleaning regimen to recover yield.
Scenario D — Lower escalation (1% per year) at base capex: NPV ≈ INR +3.1 crore; discounted payback still inside 25 years. CONDITIONAL GO — viable; lock the tariff escalation path in writing with the host DISCOM per IEEE 1547-2018 (IEEE Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces): https://standards.ieee.org/ieee/1547/5915/; CEA Connectivity Standards for generation ≥ 500 kW, Central Electricity Authority Technical Standards for Connectivity of the Distributed Generation Resources Regulations, 2019 (CEA Notification No. 12/30/2019-Trans, dated 06-Oct-2020), available via CEA regulations portal: https://cea.nic.in/regulations/.
Scenario E — Shorter horizon (10 years): PV of benefits is materially lower but NPV remains positive because capex is recovered inside the horizon at base inputs. CONDITIONAL GO — horizon sensitivity is moderate.
Scenario F — Favourable case (lower capex INR 30,000/kWp with 4% escalation): NPV rises to ≈ INR +5.6 crore with payback well inside 25 years. GO only if a hard EPC quote ≤ INR 30,000/kWp is dated and signed.

6. Equipment reference (real, publicly marketed models)

For the BOM layer beneath the TCO, the following real, currently marketed equipment is consistent with the size and topology of this use case; the TCO above is independent of model choice and assumes module-level performance only. Torque, SOC, and voltage limits in installation must be confirmed against each OEM manual revision at RFQ stage.

FunctionReal model (publicly marketed)Public document URL
PV module (mono-PERC, 540 Wp class)Jinko Solar Tiger Neo JKM540M-72HL4-BDVPhttps://www.jinkosolar.com/en/photo/TigerNeo/JKM540-72HL4-BDVP (datasheet PDF linked from product page)
PV module (n-type TOPCon, 580 Wp class)Trina Solar Vertex S+ TSM-NEG19RC.20https://www.trinasolar.com/us-en/products/vertex-s-plus (datasheet PDF linked from product page)
PV module (HPBC, 590 Wp class)LONGi Hi-MO 6 LR7-72HGD-590Mhttps://www.longi.com/en/products/hi-mo-6 (datasheet PDF linked from product page)
String inverter 50 kW (×10)Sungrow SG50CXhttps://www.sungrowpower.com/en/product/sg50cx (datasheet PDF linked from product page)
String inverter 100 kW (×5)Huawei SUN2000-100KTL-M2https://solar.huawei.com/en/products/Smart-PV-Inverter/SUN2000-100KTL-M2 (datasheet PDF linked from product page)
String inverter 60 kW (×8)Growatt MAX 60KTL3-X LVhttps://www.growatt.com/product/MAX-60KTL3-X-LV.html (datasheet PDF linked from product page)

No module, inverter, or supplier is endorsed as "verified" or "No.1" on this page; equipment names are listed solely as illustrative BOM candidates consistent with a 500 kWp hybrid C&I plant and are sourced from each OEM's public product catalogue. Model names and OEM pages are the current, publicly marketed designations as of the evidence date; specific certifications, ALMM / IECEE CB status, OEM manual title and revision, and any torque / SOC / voltage limits must be confirmed in the vendor offer.

7. Mini Cert Block (linked to primary documents)

Relevant certifications & standards to verify in vendor offers (issuer-equivalent versions, not asserted as held by any specific model on this page):
· Modules: IEC 61215-1:2021 (crystalline silicon PV — design qualification, International Electrotechnical Commission), IEC 61730-1/-2 (PV module safety qualification, International Electrotechnical Commission)
· Inverters: IEC 62109-1:2010 (power converter safety, International Electrotechnical Commission), IEC 61727:2004 (utility interface, International Electrotechnical Commission)
· BOS / design: IEC 62548:2016 (PV array installation design, International Electrotechnical Commission)
· Grid interconnection: IEEE 1547-2018 (Institute of Electrical and Electronics Engineers), CEA Technical Standards for Connectivity of Distributed Generation Resources, 2019: https://cea.nic.in/regulations/
· UN transport of cells/modules (if shipped by sea/air): UN Manual of Tests and Criteria, Section 38.3 (United Nations, lithium battery transport, where battery storage is added)
· EPC / module sourcing: MNRE Approved List of Models and Manufacturers (ALMM)
· EHS / CEA: CEA connectivity standards for plants ≥ 500 kW; state Electrical Inspector (CEIG) approval per state CEA notification
No specific certificate numbers are asserted on this page. Verify issuer, edition, and certificate / test report numbers in the vendor offer before any purchase order.

8. HS Code & Duty Block (lookup-only)

ItemHS code (India)BCDIGSTLookup
Solar PV cells8541.42PENDINGPENDINGCBIC customs tariff — verify current Finance / customs notification and ALMM list (MNRE)
Solar PV modules (assembled)8541.43PENDINGPENDINGCBIC customs tariff — verify current Finance / customs notification and ALMM list (MNRE)
DC string inverters8504.40PENDINGPENDINGCBIC customs tariff — verify current Finance / customs notification
Mounting structures (aluminium / steel)7610 / 7326PENDINGPENDINGCBIC customs tariff — verify sub-heading against the actual rail / kit SKU
DC cables (PV-rated)8544.60PENDINGPENDINGCBIC customs tariff — verify sub-heading against the actual cable SKU

BCD and IGST cells are marked PENDING by design: duty rates on solar inputs are changed by annual Finance / customs notifications and by ALMM / BCD reopening notifications, and any figure asserted here would go stale. Use the CBIC customs tariff lookup, the current India Finance / customs notification, and (for export markets) the EU TARIC consultation (