Power Sector Playbook
This playbook covers the Power sector of the Indian stock market. Use it to understand how companies in this sector make money, what metrics matter most, and...
Sector Overview
This playbook covers the Power sector of the Indian stock market. Use it to understand how companies in this sector make money, what metrics matter most, and how to value them.
What you will learn
- Business Model: Generation (thermal/solar/wind), transmission, distribution — regulated vs merchant
- Tariff & Regulation: CERC/SERC tariff orders, cost-plus model, competitive bidding, open access
- Renewable Transition: Solar LCOE, RE purchase obligations, hybrid projects, battery storage
- Distribution Challenges: AT&C losses, discom health, privatization, smart metering
- Valuation: Regulated ROE models, DCF for projects, sum-of-parts for utilities
Sub-industries in this sector
| Basic Industry | Playbook |
|---|---|
| Integrated Power Utilities | View playbook |
| Power - Transmission | View playbook |
| Power Distribution | View playbook |
| Power Generation | View playbook |
| Power Trading | View playbook |
How to use this playbook
Start with the Business Model lesson to understand how companies in this sector generate revenue. Then move through metrics, risks, and valuation in sequence. Each lesson builds on the previous one.
1. Power — Business Model
What you will learn
- The 3 segments of electricity: Generation → Transmission → Distribution
- Regulated return model (cost-plus) vs merchant power (market-driven)
- How gencos, transcos, and discoms make money differently
- Why regulated utilities are bond-proxies and merchants are cyclical
- India's unique power sector structure (state vs central vs private)
The electricity value chain
India's installed capacity: 430+ GW (FY24). Annual generation: 1,700+ BU. The sector is growing 5-7% annually driven by industrial demand, data centers, and EV charging.
Business Model 1: Power Generation (Gencos)
Regulated (cost-plus) model
Most thermal and hydro capacity operates under long-term PPAs (Power Purchase Agreements, typically 25 years). Revenue is guaranteed.
Revenue = Fixed Charge (capacity) + Variable Charge (fuel cost pass-through)
| Component | What it Covers | Risk to Company |
|---|---|---|
| Fixed charge | Return on equity (15.5% regulated ROE), depreciation, O&M | None — guaranteed if plant is available |
| Variable charge | Fuel cost (coal/gas) passed through to buyer | Minimal — pass-through (buyer bears fuel risk) |
| Incentive | Bonus for >85% PLF (Plant Load Factor) | Upside (earn extra for higher availability) |
| Company | Model | Capacity | Revenue (FY24) | Key Trait |
|---|---|---|---|---|
| NTPC | Regulated (Central PSU) | 76 GW (incl JVs) | ₹1,80,000 Cr | Guaranteed 15.5% ROE |
| NHPC | Regulated (Hydro) | 7 GW | ₹12,000 Cr | Low-cost, long-life assets |
| Adani Power | Mix (regulated PPA + some merchant) | 16 GW | ₹55,000 Cr | Aggressive growth |
| Tata Power (genco) | Regulated + some merchant | 14 GW | ₹60,000 Cr | Transitioning to renewables |
Regulated ROE = bond-like return
NTPC earns a guaranteed 15.5% ROE on its equity base. As long as the plant is available (PLF not relevant for fixed charge), revenue flows in. This makes regulated gencos pseudo-bonds — predictable, low-risk, moderate-return.
Merchant power model
Merchant plants sell electricity on power exchanges or through short-term contracts. Revenue depends on spot prices.
| Market Condition | Spot Price (₹/kWh) | Merchant Margin |
|---|---|---|
| Surplus (low demand, mild weather) | ₹2.5-4.0 | Breakeven to loss |
| Normal | ₹4.0-6.0 | Moderate profit |
| Deficit (peak summer, coal shortage) | ₹8-20+ | Windfall profits |
| Company | Merchant Exposure | Revenue Volatility |
|---|---|---|
| JSW Energy | ~30% merchant | High quarterly swings |
| Adani Power (some plants) | ~20% merchant | Concentrated in Q1 (summer) |
| CESC | Minimal merchant | Stable (regulated) |
Business Model 2: Transmission (Transcos)
Transmission is the most predictable power sub-segment. Revenue model:
Revenue = Transmission charge × Capacity available
Build the line → earn fixed tariff for 35 years. No fuel cost, no demand risk.
| Company | Model | Revenue (FY24) | ROE | Key Trait |
|---|---|---|---|---|
| Power Grid Corp | Regulated (Central) | ₹46,000 Cr | 18-20% | India's only inter-state grid owner |
| Adani Transmission (now Adani Energy) | Regulated (Private) | ₹18,000 Cr | 12-14% | Fastest growth in private transmission |
| Sterlite Power (unlisted) | Build-own-operate | - | - | Won many TBCB projects |
Power Grid = India's safest utility
Power Grid Corp earns ~20% ROE with zero fuel risk, zero demand risk, and guaranteed 35-year revenue per line. It's essentially a regulated infrastructure bond with 4%+ dividend yield.
Business Model 3: Distribution (Discoms)
Distribution is the weakest link in India's power chain. Most discoms are state-owned, loss-making, and politically constrained.
| Private Discom | Area | Revenue (FY24) | AT&C Loss | PAT Margin |
|---|---|---|---|---|
| Tata Power Delhi | Delhi (North) | ₹12,000 Cr | 7-8% | 5-6% |
| BSES (Reliance Infra) | Delhi (West, East) | ₹15,000 Cr | 8-9% | 3-4% |
| CESC | Kolkata | ₹10,000 Cr | 3-4% | 8-9% |
| Torrent Power | Ahmedabad, Surat, Bhiwandi | ₹16,000 Cr | 5-6% | 8-10% |
India's ownership structure
| Type | Genco Examples | Regulator | Tariff Model |
|---|---|---|---|
| Central PSU | NTPC, NHPC, Power Grid | CERC | Cost-plus, 15.5% regulated ROE |
| State PSU | State Gencos, State Transcos | SERC | Cost-plus (often under-recovered) |
| Private (regulated PPA) | Adani, Tata, JSW | CERC/SERC | PPA-linked (contracted) |
| Private (merchant) | Same companies, some capacity | No tariff regulation | Market-driven (exchange price) |
| Private Discom | CESC, Torrent, Tata Power Delhi | SERC | Cost-plus with regulatory oversight |
Key business model metrics
| Metric | What it tells you | Good | Red flag |
|---|---|---|---|
| PLF (Plant Load Factor) | Asset utilization | >75% (thermal) | <55% (stranded capacity) |
| Availability | Earns fixed charge | >85% | <80% (maintenance issues) |
| Regulated ROE | Return guarantee | 15.5% (CERC norm) | Lower if equity base depleted |
| AT&C loss (discoms) | Billing efficiency | <10% | >20% (theft/subsidy issue) |
| Debt/Equity | Leverage (capex-heavy sector) | <2× | >3× (balance sheet stress) |
| Fuel cost pass-through | Revenue security | Full pass-through (cost-plus) | Partial or delayed (political risk) |
Indian context
🗣️
"Power sector mein teen alag-alag business models hain — generation, transmission, distribution. Sab ka risk-return bahut alag hai. Transmission sabse safe hai (Power Grid = bond jaisa). Generation regulated vs merchant mein banta hai. Distribution sabse risky hai — political interference bahut zyada hai."
✅ Checklist
- ○I understand the difference between regulated (cost-plus) and merchant power
- ○I know transmission is the safest, most predictable sub-segment
- ○I can identify why most discoms are loss-making (AT&C loss + subsidy)
- ○I use PLF and availability as key operating metrics
- ○I understand India's multi-regulator structure (CERC/SERC)
Key takeaway
Power is not one sector — it's three distinct businesses. Generation (cost-plus = bond-like, merchant = cyclical), Transmission (safest — build once, earn 35 years), Distribution (riskiest — political tariffs, theft, subsidies). Invest based on which model suits your risk appetite: NTPC/Power Grid for stability, JSW/Adani for growth, avoid state discoms.
2. Power — Tariff & Regulation
How CERC and SERCs determine electricity tariffs in India The costplus tariff mechanism and its guaranteed return structure Competitive bidding (TBCB) and ho...
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3. Power — Renewable Transition
India's 500 GW renewable target and what it means for investors Solar and wind LCOE breakdown and tariff economics RE Purchase Obligations (RPO) and how they...
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4. Power — Distribution Challenges
Why discoms are the weakest link and what's changing AT&C losses explained — theft, billing failure, collection gaps The smart metering revolution (25 Cr met...
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5. Power — Valuation
How to value regulated utilities (NTPC, Power Grid) — regulated ROE model How to value RE developers (Adani Green, JSW Energy) — EV/MW + DCF Sumoftheparts fo...
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