Size a market that replaces something: Urjavik Storage sells battery packs to replace diesel generators at telecom towers. How big is the market, and does the product pay for itself?

The market is about Rs 14,700 crore of batteries, roughly Rs 2,450 crore a year on a six-year replacement cycle, and each system pays back in about 4.2 years. That payback inside a six-year life is what makes the market exist at all. But the margin is thin: the battery earns its buyer about 11.5% a year, so the market is real only for operators whose money costs less than that.

A family that switches from a petrol scooter to an electric one is not spending new money on transport; it is moving money from the petrol pump to the battery. A substitution market is sized from the spend it displaces, and it exists only where the switch pays for itself. So start with who burns diesel, not with how many batteries could be sold. Of 7 lakh towers, the 35% with long outages are the ones whose generators actually run: 2.45 lakh towers. The other towers have reliable grid power and no diesel bill to save.

Each of those towers needs one Rs 6 lakh system. 2.45 lakh towers times Rs 6 lakh is Rs 14,700 crore of batteries. Because each system lasts six years, the recurring market is about Rs 2,450 crore a year once the base is converted. Keep the two numbers apart in the room: the first is the size of the prize, the second is what the company can sell in a normal year. The whole tower base, at Rs 42,000 crore, is not the market, because towers without outages have nothing to substitute.

The tower saves 80% of Rs 1.8 lakh, Rs 1.44 lakh a year. Rs 6 lakh divided by Rs 1.44 lakh is a simple paybackThe number of years of savings needed to recover the purchase price, ignoring the cost of money and anything after that point. of 4.17 years. Over six years the battery saves Rs 8.64 lakh, 1.44 times its cost. Across the whole serviceable base that is Rs 3,528 crore of diesel a year that would stop being bought. A payback shorter than the product's life is the minimum condition for a substitution market; without it, no operator switches however good the technology.

Payback ignores the cost of money. A tower company that borrows at 12% must earn more than 12% on the battery. Six years of Rs 1.44 lakh discounted at 12% is worth Rs 5.92 lakh, slightly less than the Rs 6 lakh price. The battery returns about 11.5% a year to its buyer, so it clears the bar for an operator with cheap money and fails it for one with expensive money. That single number tells you the market is real but fragile.

So the diligence questions follow from the sensitivity, not from the headline. Is diesel likely to cost more over the battery's life, which widens the gap? Will battery prices keep falling, which helps the next sale but can strand a customer who bought early? Does the 80% cut hold in towers with eight-hour outages, where the battery may not last the night? Close with the view: the market is about Rs 14,700 crore and genuine, but Urjavik's sales pitch should be built around financing or leasing the battery, because the buyer with cheap money is the buyer who says yes.