Simpa let villagers buy solar in tiny installments, with the panel as its own collateral

The villagers Simpa targeted in Karnataka and later Uttar Pradesh had two bad options: kerosene, which ate cash and burned houses, or a solar home system priced at $150-500 — months of income, payable upfront. The conventional financing fix was microcredit, but small loans for a box on the roof are hard to underwrite, hard to collect, and easy to fear. India's grid, meanwhile, had not arrived: ADB noted Uttar Pradesh alone had 19.4 million households without electricity.

Simpa Networks, a Bengaluru company co-founded by former Microsoft engineer Paul Needham, replaced the loan with the prepaid logic of the mobile phone. Customers paid a 10-30% down payment and then bought energy credits by SMS in whatever dribs and drabs their cash flow allowed — a farmer profiled by Bloomberg paid about $1 for a week of light. The tamper-proof Simpa Regulator metered usage, reported it to Simpa's revenue system, and each payment built equity toward permanent ownership; SELCO handled installation and three years of service.

The design made the product self-collateralizing: disconnection is a software command, so the cost of a default is near zero and no debt collector ever visits. Payments that stop do not evaporate — they are banked against eventual ownership, which makes resuming rational. By 2013 the model had attracted a $2 million equity investment from ADB, expansion into Maharashtra and Uttar Pradesh, and a plan to reach more than 63,000 rural households; Simpa also licensed the same prepaid metering to solar micro-grid developers.

Make the solar kit its own collateral.

Prepaid energy matches unpredictable rural incomes: customers buy $0.88 credits when they have cash instead of servicing a fixed monthly debt.

Every payment buys something today (light) and equity tomorrow (ownership), so paying feels like progress, not obligation.

The meter makes default cheap to handle — power off, no field visit — which is what lets a company sell to customers no credit bureau has ever scored.

Banked payments remove the fear that stops the poor from financing: stopping is a pause, not a forfeiture.

Ownership is the prize — a system that unlocks itself forever creates a ten-year payback story no kerosene purchase can match.

Repossession is what makes lending to the poor expensive — so build the collateral into the product. A device that can switch itself off turns an unsecured loan into a secured one.

After a strong market response in Karnataka, Simpa pushed into Uttar Pradesh — 19.4 million unelectrified households — and Maharashtra, with plans to serve over 63,000 rural households within two years of ADB's March 2013 investment. The same prepaid metering was offered to solar micro-grid developers as a customer and revenue-management system, pointing at where the model traveled next: pay-as-you-go unlock logic became the standard way off-grid solar reached customers that banks and grid companies had written off.