Many people think EV charging is simple: buy a charger, sell electricity at a higher rate, keep the difference. In reality, the biggest silent factor that decides profit is your electricity cost — and in India that cost is not always as simple as ₹X per unit.
Why electricity tariff matters so much
Two charging stations in the same city can charge customers the same price, but one makes decent profit and the other struggles. A common reason: the electricity tariff category, fixed charges, and how the power connection is structured.
- Your per-unit cost (what you pay per kWh)
- Your fixed charges (costs that come even if charging is low)
- Your monthly bill behaviour (some months surprise you)
Tariff is not just '₹ per unit'
Most electricity bills have multiple parts. Names vary by DISCOM, but the idea is similar.
| Component | What it means |
|---|---|
| Energy charge (₹/kWh) | What you pay for each unit consumed |
| Fixed charge (monthly) | A flat cost regardless of usage |
| Demand charge | Based on your peak power draw (kVA) |
| Taxes & surcharges | State-level additions to the bill |
Demand charges — in simple words
Demand is not only about total units used. It can also depend on how high your peak usage goes.
A powerful charger can create higher peaks, which changes your bill structure. A 60kW DC charger has a very different demand profile from two 7.4kW AC chargers — even if total monthly kWh is similar.
What tariff category might your EV charging fall under?
- Domestic / residential — sometimes for private society setups
- Commercial — common for public-facing sites
- Special EV charging category — available in some states with lower rates
- Industrial — sometimes for fleets/depots
What to ask before you install
- Expected per-unit electricity cost at this site?
- Any fixed charges — how much monthly?
- Any demand charges — how are they calculated?
- Will load enhancement be required, and what's the timeline?
- Separate meter for charger or existing meter?
- Any time-based tariffs in this state?
Practical ways to keep power cost under control
- Don't oversize the charger for the site demand
- Prefer sites with power already available
- Do electrical work properly — avoid faults and inefficiency
- Keep utilisation steady so fixed costs don't hurt per-session economics
- Track bills monthly and adjust pricing if needed
If costs fluctuate due to fixed or demand charges, keep a margin buffer. Reliability and convenience often matter more than being the cheapest charger in the area.