Tata Sierra EV 75 RWD Makes Less Power Than 63 kWh: The Odd Math Explained
Tata Motors has confirmed that the Sierra EV 75 kWh RWD is deliberately rated lower than the 63 kWh RWD. The smaller battery makes 238 PS, the larger one 209 PS, a gap of 29 PS despite the 75 kWh sitting a rung higher and costing roughly Rs 1 lakh more.
What was announced
At launch, the Tata Sierra EV lineup threw up a specification that ran against buyer instinct. The 63 kWh RWD variant is rated at 238 PS (175 kW), while the 75 kWh RWD sits at 209 PS (154 kW), a 29 PS or roughly 12.2% deficit for the larger, pricier pack. Across comparable trims, the 75 kWh commands about Rs 1 lakh more than the 63 kWh.
The 75 kWh Sierra EV wins on range, the 63 kWh wins on punch. Tata has, unusually, made the cheaper variant the enthusiast's choice.
Responding to a query on the mismatch, Tata Motors said this is an intentional engineering choice, not a spec sheet slip. Both the 63 kWh and 75 kWh packs are packaged in the same physical volume. To fit more energy into that identical footprint, Tata moved the 75 kWh unit to higher capacity cells and to a cell-to-pack (C2P) architecture. The trade-off is in the motor calibration and current draw the pack is set up to deliver, which is where the power gap originates.
| Parameter | Sierra EV 63 RWD | Sierra EV 75 RWD |
|---|---|---|
| Battery | 63 kWh | 75 kWh |
| Peak power | 238 PS (175 kW) | 209 PS (154 kW) |
| Architecture | Standard pack | Cell-to-pack (C2P) |
| Price premium | Base | ~Rs 1 lakh higher |
Power figures as per Tata Motors' official technical specifications for the Sierra EV RWD variants.
The Car Jury verdict
Tata's explanation, that both packs share the same physical volume and the 75 kWh uses a higher energy density cell with cell-to-pack architecture, is engineering-honest but marketing-awkward. Buyers walking into a showroom see a bigger number, a higher price, and fewer horses. That is a hard sell no matter how neatly the whitepaper reads. Biturbo Media's line that "Tata builds their cars like tanks" captures the brand's real strength; the Sierra EV needs that goodwill here.
Our call: if you want range, the 75 kWh is still the pick, and the power delta is academic in daily use. If you want the sharper drive, the 63 kWh is genuinely the enthusiast's Sierra EV. Cross-shoppers eyeing the Harrier EV or Curvv EV should note Tata's pattern of tuning packs for balance, not headline numbers.
