A 1 MW solar plant in India is one of the more accessible mid-cap infrastructure investments available to retail investors. The economics are stable, the policy environment is supportive, and the operational complexity (once built) is low. The catch is that the marketing-brochure numbers and the actual investor-side numbers are very different.
The honest economics
For a pure financial investor — no captive consumption, just selling power to others — the realistic picture for a 1 MW plant:
- Capital expenditure: ₹4–5.5 crores (panels, inverter, mounting, BoS)
- Land: 4–5 acres
- Daily generation: 4,000–5,000 kWh
- Annual generation: ~14–15 lakh units
- Annual revenue: ₹40–55 lakhs (selling power at ₹3–5/unit minus charges)
- O&M cost: ₹6–10 lakhs/year
- Annual yield: 10–12% pre-tax
- Payback period: 7–10 years
- Plant life: 25+ years (panels degrade ~0.5–0.7% per year)
- Lifetime multiple: 6–8x over 25 years if reinvested
After payback, the remaining 15–18 years generate mostly-profit cash flows, which is where the long-term return comes from.
Where the “3–4 year payback” claim comes from
EPC company marketing routinely cites 3–4 year paybacks. This is true but only for self-consumption scenarios — a factory or commercial building that’s currently paying ₹8–12/unit to BESCOM or TANGEDCO. Replacing that grid power with self-generated solar at ₹3–4/unit produces ₹5–8/unit in savings, which compresses the payback dramatically. Accelerated depreciation (40% in year one) adds another tax shield.
The 3–4 year math assumes:
- You consume the power yourself (cost avoidance, not revenue)
- You have taxable profits to absorb the depreciation benefit
Neither applies to a pure investor without consumption. The 10–12% annual yield with 7–10 year payback is the honest range for investor economics.
Where the costs go
The capex sticker price of ₹4–5 crores is just the start. Hidden costs that often blow up budgets:
- Grid connectivity: If the nearest substation is several kilometers away, cabling and bay extension can add ₹45–70 lakhs.
- Land acquisition and conversion: Karnataka land titles, conversion permissions, and brokers add time and cost.
- Regulatory approvals: CEIG clearance, DISCOM permissions, open-access nods. Multi-month process.
- Bank guarantee: ₹10,000 per MW for long-/medium-term open access.
This is why most retail investors now go through the group captive model or PPA-based shared solar parks, where an EPC provider handles all of the above.
The charges that erode returns
In Karnataka (BESCOM) as of 2025/2026, an open-access solar investor pays:
- Transmission charges
- Wheeling charges — varies by state, ₹0.50–1.50/unit in many states
- Cross-subsidy surcharge (CSS) — ₹0.50–2.00/unit (significant)
- Additional surcharge — variable; BESCOM has petitioned for an increase
- Banking charges — 8% in kind for monthly banking, no carry-forward beyond month
- Standby charges — 125% of normal energy charges
The CSS and additional surcharge are the largest. Avoiding CSS is the entire point of the group captive structure.
The shift to solar + storage
A real warning for 2026 investors: ~43 GW of solar projects are stuck in India, mostly because they were plain solar without battery storage. In FY26, 90% of new awards (5.8 GW) include storage; only 10% is standalone solar.
DISCOMs are increasingly reluctant to sign PPAs for plants that only generate during peak sun hours (10am–3pm), when grid supply is already excess. The days of “build solar, grid will buy it” are ending.
Any new project should either:
- Have a firm PPA already signed with a creditworthy offtaker, or
- Include battery storage in the project design
State comparison: Karnataka vs Tamil Nadu
Bangalore (BESCOM, Karnataka) and Hosur (TANGEDCO, Tamil Nadu) are 40 km apart but in completely different regulatory regimes.
Karnataka:
- Mature open-access framework (KERC 2025 rules)
- Established solar park infrastructure (e.g. Pavagada 2 GW)
- 15-working-day approval timelines
- Group captive structures well-established
- 8,000+ MW of installed solar capacity
Tamil Nadu:
- Higher network and open access charges
- No officially recognized solar parks under the MNRE National Solar Park scheme
- Less policy support, financial struggles at TANGEDCO
- FY26 transmission tariffs increased 4%
- 25% haircut on unused banked energy
For an investor based in Bangalore, Karnataka wins unless you have a specific industrial offtaker lined up in Hosur SIPCOT.
Three paths to deploy capital
Ranked from least to most operational involvement:
1. Solar investment platforms (lowest headache)
Platforms like SustVest and SundayGrids pool retail capital into rooftop PPA deals at commercial buildings. Advertised IRRs of 10–12%. You don’t own a physical asset; you own a financial position.
Pros: completely hands-off. Cons: counterparty/platform risk; deals are small; relatively new and unproven at scale.
2. CAPEX in a shared solar park via EPC (medium headache)
Buy a plot of pre-developed solar park land (developer like Dexler Energy, CleanMax, Fourth Partner Energy, O2 Power), have them build and operate the 1–2 MW plant for you. You own the asset.
Pros: physical asset ownership, accelerated depreciation tax benefit, predictable cash flow. Cons: still requires due diligence on PPA terms and counterparty; the regulatory environment can shift.
3. Group captive structure (medium headache, best economics)
Take a 26% equity stake in a solar generating SPV; consume proportional power at cost; the rest goes to the group. Avoids CSS and additional surcharges, making landed cost 30–40% below DISCOM rates. See Group Captive Solar Model.
Pros: best landed cost economics; legal structure is established. Cons: requires having an entity that actually consumes power, or pooling with companies that do.
What to actually do
For a Bangalore-based investor with a few crores and no current power consumption:
- Talk to mid-market EPC providers in Karnataka. Dexler Energy (Bangalore-based, 1–5 MW range projects, mid-market focus) is a sensible starting conversation. CleanMax and Fourth Partner Energy operate at larger scale.
- Get independent verification. EPC marketing IRRs are optimistic. Hire an independent energy consultant to verify the landed-cost math against current KERC tariff orders.
- Insist on PPA + offtaker visibility. Don’t deploy capital into a “build it and they will come” structure. Have a creditworthy offtaker locked in before construction.
- Model storage scenarios. Standalone solar is a fading bet; understand what adding storage does to capex and returns.
The realistic outcome: a passive 10–12% annual yield, 7–10 year payback, 25-year asset life. Not the 64% XIRR claimed by EPC ads, but genuinely solid by Indian fixed-income standards, and a real physical asset rather than a financial promise.