The d.light Story: A Stanford class project that became Africa’s largest solar company
Sometime in the year 2004, in a small village in the Atlantique department of southern Benin, a household kerosene lamp tipped over and ignited the clothing of a twelve-year-old boy. The boy survived. He carried the scars of that night for the rest of his life.
The young Peace Corps volunteer who lived next door to that family was named Sam Goldman. He could not stop turning the moment over in his head. Why, in the year 2004, were one and a half billion people in the world still using a nineteenth-century fuel to light their homes after dark?
He went back to America, enrolled at the Stanford Graduate School of Business, and walked into a design class that would, over the next twenty years, become the largest off-grid solar company on the African continent — and, almost incidentally, the first company in the history of African energy to convince a Wall Street debt market to lend against the daily two-dollar payments of rural farmers.
This is the story of how a kerosene burn in a village became a bond market in Nairobi.
The Class He Wasn’t Admitted To
To understand d.light, you have to begin with two people who almost did not meet, and a class one of them was not admitted to.
Sam Goldman grew up everywhere. His parents were USAID staff. By the time he was eighteen he had lived in Cameroon, Mauritania, Pakistan, Peru, India, Rwanda, Canada, and Hong Kong. He went to the American Embassy School in New Delhi, took a science degree in biology and environmental studies at the University of Victoria in Canada, and then, between 2001 and 2005, served as a Peace Corps Volunteer in Benin, posted to a rural village to work on agro-forestry and youth development. It was there that the burn happened.
He returned to North America in 2005 looking for a vehicle for what he had seen. In 2006, he enrolled at the Stanford Graduate School of Business.
Ned Tozun arrived at Stanford by a very different route. American-born, of Turkish-Cypriot heritage, a Stanford undergraduate who had already founded one software company before coming back for an MBA. His own formative observation, on family trips, had been the gap between the steady electricity of Silicon Valley and the nightly flickers of the lights in Northern Cyprus.
The two of them met in a course called Design for Extreme Affordability. Run out of the Stanford d.school by a professor named Jim Patell, the course paired mixed teams of MBA, engineering, medical, and design students with a partner organisation in a developing country and gave them a single brief — design a product or service for customers living on less than four dollars a day.
Tozun was not admitted. The course was famously over-subscribed and ran a competitive selection process. He didn’t get in. His own account of what happened next, recorded years later by Stanford’s Changemakers programme, is almost the entire founding story in a single sentence.
“I just kept showing up,” he said. “For weeks and weeks I just kept showing up.”
He sat in the lectures uninvited. He sat through the team-formation sessions uninvited. Eventually he was let in on persistence alone. On the team he met Goldman, who pitched what would become d.light — a battery-powered LED household light, designed and priced for the rural poor, that would make the kerosene lamp obsolete.
The course produced the original prototype. A hand-cranked LED lantern, tested in rural India and Myanmar in 2006. The hand-crank lasted weeks. Customers were happy to leave a small panel on the roof of their hut all day. They were not happy to spend ten minutes cranking a handle every evening. The crank came off. A solar panel went on. The product the company would launch with had already, in field testing, redesigned itself.
Goldman and Tozun incorporated d.light Design in Stanford’s class of 2007 spring quarter and graduated into running the company. The early financing was the stitched-together coalition typical of social-enterprise founders. Around three hundred thousand dollars in business-plan-competition winnings. A pre-seed cheque from a New York non-profit called Acumen, which described its money, accurately, as patient capital. A Series A of about six million dollars led by Nexus Venture Partners out of India, with Draper Fisher Jurvetson and Garage Technology Ventures alongside.
The first manufactured product was named the Nova. A small solar lantern with a detachable photovoltaic module, a USB charging port for a feature phone, and an outdoor cable. It shipped in India in June of 2008 — and it shipped from Shenzhen.
The decision to co-locate product design with the Shenzhen manufacturing base would, more than any other early call, define the company’s unit economics. d.light could iterate its hardware on a six-week cycle. It could undercut Western-designed-and-manufactured competitors by thirty to fifty percent on the bill of materials. It was, from year one, a Chinese-manufactured, American-incorporated, Indian-launched, African-bound company.
The Year the Money Ran Out
The next seven years were the years d.light became an African company in everything but its incorporation.
Distribution partnerships started in East Africa in 2010. Direct operations launched in Kenya in 2011. In the same year, a piece of corporate-governance hygiene that, in hindsight, is the first warning sign of the trouble that was coming — Goldman moved from CEO to Chief Customer Officer, and the board brought in an outside chief executive named Donn Tice. Tice was a career consumer-marketing executive from companies like Clorox and Coleman. The framing at the time was that the company needed adult supervision for its scaling phase.
By 2014 the product line had widened. The Nova lantern had been joined by a family of larger solar home systems — a roof-mounted panel, a control unit, a lithium battery, two to four LED bulbs, an FM radio, a torch, and a USB charger. The S250, the D30, the D180. Each one designed for a slightly larger household.
The customer base was widening too. By 2014, d.light had passed twenty million people reached. The Schwab Foundation named Goldman and the company Social Entrepreneurs of the Year. He won the Charles Bronfman Prize. From the outside, d.light looked like the breakout story of African off-grid solar.
From the inside, the company was running out of money.
The version of the story that d.light tells about itself glosses lightly over the 2014–2015 period. The version recorded in the Acumen case study is harder. The company was cash-burning. It had grown too fast across too many geographies. Channel conflict was breaking out internally — the NGO partners wanted one set of margins, the retail distributors wanted another, and a new pay-as-you-go pilot team wanted to bypass both. Senior management was strained. Cash was tight enough that the company would not have made payroll, in some months, without bridge support from its existing investors.
Somewhere in the second half of 2015, the board acknowledged the truth on the ground. d.light, the year the world celebrated its hundred-million-customer trajectory, was within months of folding.
The rescue came from the place it almost always came from. Acumen — the New York non-profit that had written the first cheque in 2007 — led the bridge round. The Shell Foundation came in alongside. A handful of impact LPs followed. The combined amount was undisclosed at the time, and it was small relative to a normal venture round of that company’s stage. It was enough.
The condition attached to it was bigger than the money. Tice would step down. The founders would take the wheel back. And the company would commit to a specific strategic pivot, which the board had been arguing about for two years and had not been willing to make under cash pressure.
Ned Tozun became chief executive in 2015. The pivot the board had committed him to was the decision that would, over the next decade, turn d.light from a Stanford-class-project lantern brand into a financial-services company. They were going to stop selling solar systems for cash.
They were going to start selling them on credit.
If the company survived, they would have invented an asset class. If it didn’t, they would have buried themselves trying to lend money to people the formal banks had spent a hundred years declining.
The Two-Dollar Bond
The product the team rebuilt around, in the foundry of the 2015 crisis, was called the D30, and then the D180. From the outside they were ordinary-looking solar home systems. From the inside they were credit instruments.
The customer no longer paid two hundred dollars for the box. The customer paid a small deposit — sometimes as little as one week’s kerosene spend — and then a daily mobile-money payment of about thirty to sixty US cents. The price of a stick of kerosene, the agents would say at the door. Pay every day for eighteen to twenty-four months and the unit unlocks permanently. Miss a payment and the embedded SIM card refuses to power the LEDs on — until a top-up token is entered.
This is the part of the story that has to be told honestly. Over the full pay-as-you-go cycle, the rural customer pays roughly one and a half to two times the cash retail price of the same box. Industry critics — the Energy for Growth Hub, CGAP — call this the poverty premium. A fifty to a hundred percent effective interest charge, paid by the poorest twenty percent of African households. d.light’s answer is that the markup funds the cost of capital, the credit losses, and the rural agent network that makes delivery possible in the first place, and that the alternative — kerosene — is still more expensive by a margin. Both things are true at once. This is the moral architecture of the company.
By 2018, d.light had reached a hundred million people. In January of 2020, by its own counting, it crossed the hundred-million-customer milestone that Goldman had set, sitting in that Benin compound, as the lifetime ambition of the company.
They had hit the founding goal.
They had also, almost without anybody outside the building noticing, built something nobody in African energy had ever built before.
Every D180 sold on pay-as-you-go was a contract. A small, daily-amortising contract between d.light and a Kenyan or Ugandan or Tanzanian household. By 2020, the company had a balance sheet full of those contracts — millions of them — and the actual repayment data, year over year, on whether rural customers honoured them.
The data said they did.
An asset-backed bond, the financial-services world knew, is an instrument you build when you have a pool of small, predictable receivables that pay over time. Auto loans. Credit-card balances. Mortgages. The largest debt markets in the world run on this principle. Off-grid African solar had never had it — because off-grid African solar had never had the receivables.
Until d.light did.
In 2020, d.light closed a vehicle called Brighter Life Kenya 1 — a hundred-and-ten-million-dollar securitization facility, structured by a Mauritius-based outfit named African Frontier Capital, backed by the receivables of d.light Kenya’s pay-as-you-go customer book. It was the first asset-backed bond ever issued in the off-grid solar sector. The instrument was unrated, the buyers were predominantly development-finance institutions, and almost nobody in the broader bond market noticed.
What they had built was a way to convert two-dollar daily payments from rural African households into an investable security.
From Charity Sector to Capital Markets
The decade after the Brighter Life Kenya facility closed is the decade in which off-grid African solar stopped being a charity sector and became a capital-markets sector.
By 2021, d.light had closed a second Kenya facility — a hundred and twenty-seven million dollars. By 2023, a Tanzania facility, around eighty million, and a Nigeria facility, around forty-five million. In July of 2024 came the headline. A hundred-and-seventy-six-million-dollar multi-currency facility called Brighter Life by d.light, covering Kenya, Tanzania, and Uganda simultaneously, structured by African Frontier Capital, projected to fund the electrification of around six million additional people over the next three years.
That was the public number. The number inside the building was different.
In February of 2024 — five months before the new facility closed — the original Brighter Life Kenya vehicle, the first-of-its-kind 2020 instrument, fully repaid its senior debt ahead of schedule from operating cash flow. The repayment confirmation was a single document. Nobody outside a small circle of impact investors saw it. It is, in this narrator’s view, the most important paragraph in the modern financial history of African energy.
Until that moment, every institutional investor who had looked at off-grid solar had asked the same question. Yes, the lanterns work. Yes, customers want them. But will rural Africans actually repay an eighteen-month financing schedule, at portfolio scale, across several million households, across multiple years, through droughts and elections and currency devaluations and political crises?
The answer, on the morning of the BLK1 final-repayment confirmation, was on paper. They had. The portfolio had behaved. The model had held. The receivables were real.
That single event opened a door that had been closed for fifteen years. Once a securitization in this asset class had been originated, performed, and repaid at term, it could be modelled. Once it could be modelled, it could be rated. Once it could be rated, it could be sold to the same capital pool that buys auto-loan bonds in the United States — a pool that is roughly two orders of magnitude larger than the impact-investing money that had carried the sector for its first decade.
By 2025, d.light’s cumulative receivables-backed financing had crossed eight hundred and forty-two million US dollars across five facilities. The company stated publicly, for the first time, that it no longer required equity funding to grow. It was financing itself from operating cash flow plus debt against its own customer book.
Inside the building, the move had a second consequence. The centre of gravity of the company — its capital, its receivables, its largest customer base, its operational management — had moved decisively from San Francisco to Nairobi. Riverside Drive replaced California as the address that mattered. The two co-founders, the American Sam Goldman and the Turkish-American Ned Tozun, had built — at the executive layer — an African financial-services business with a hardware product attached.
If the M-Pesa episode of this series was about the bank that wasn’t supposed to be a bank, the d.light episode is about the bond market that wasn’t supposed to exist.
The Billion-Person Question
By the end of 2024, Ned Tozun had been named to TIME’s hundred most consequential people in climate. The company was a finalist for the Earthshot Prize in the Clean Our Air category. The number Sam Goldman had set, sitting in that Benin compound twenty years earlier, had been hit — and quietly passed.
The figure d.light files officially with the Earthshot Prize is one hundred and seventy-five million lives reached, cumulatively. That is the safest defensible number, and the one this episode will hold to on screen. Internal company materials put the figure closer to one hundred and ninety million by the end of 2024, with two hundred million as the operating target inside the building. Either way, around one in twenty-five human beings alive today has, at some point, owned a piece of plastic with a d.light logo on it.
The next goal is one billion by 2030.
That figure is, on its face, almost arithmetically improbable. One billion people is roughly twelve percent of the projected global population at the end of the decade. To hit it, d.light would need to roughly five to six times its current cumulative reach in the next five years. The company’s own bet is that the securitization platform now in place — eight hundred and forty-two million dollars and counting — is the financial infrastructure that makes the answer possible.
Three open questions remain. The first is the poverty premium. The pay-as-you-go markup is still real, and the disconnection risk — the GSM-lock that plunges a missed-payment customer back into darkness — is still the most ethically uncomfortable feature of the model. The second is competition. Sun King, M-KOPA, Bboxx, Engie Energy Access — seven companies between them now take seventy-two percent of all financing flowing into the African off-grid solar sector. d.light’s bet is that its financial-engineering moat outscales channel and product. That bet is not yet won. The third is product. The next category, the company has said publicly, is the DC refrigerator — the appliance d.light believes will be to its current customer what the LED lamp was to the household in Benin.
The bond market that wasn’t supposed to exist is now five years old. The boy who was burned in a small village in 2004 is in his early thirties. The company that grew out of his accident is, in May of 2026, one of the largest off-grid energy operators on the African continent — and almost certainly the most consequential financial experiment in the history of rural electrification.
Every empire has an origin.
d.light’s was a kerosene lamp that tipped over in a small village in Benin in the year 2004.
The boy who was burned that night did not die.
The young Peace Corps volunteer who lived next door did not look away.
This is Asili Africa.
Key Takeaways
- The Class He Wasn’t Admitted To. To understand d.light, you have to begin with two people who almost did not meet, and a class one of them was not admitted to.
- The Two-Dollar Bond. The product the team rebuilt around, in the foundry of the 2015 crisis, was called the D30, and then the D180.
- From Charity Sector to Capital Markets. The decade after the Brighter Life Kenya facility closed is the decade in which off-grid African solar stopped being a charity sector and became a capital-markets sector.
- The Billion-Person Question. By the end of 2024, Ned Tozun had been named to TIME’s hundred most consequential people in climate.
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