Nairobi has plenty of signs that Kenya is ready to rethink what “energy access” means in practice. Walk past high-rises and hardware shops, and you can find small stalls running businesses the same way they have for years: with diesel. Then you meet Milcah Wanjiru, a bespectacled shop owner who runs a milling operation out of her roadside shop and sells everyday staples like milk, bread, and matches. What’s different about her mill is the fuel. Wanjiru’s machine can run on either solar energy or electricity from the grid, designed by Agsol, and she has been using it since December 2025.

Carr did not show up for a ceremonial tour. He is the CEO and cofounder of Agsol, and he came to get Wanjiru’s feedback because small, operational details decide whether a product survives in the real world. Her main issue: sometimes the milling process can be slow, and grain can get stuck in the front chamber where it feeds into the machine. “Sometimes, the whole thing jams,” Wanjiru told Carr, describing a frustrating failure mode that matters to customers waiting for service. Carr responded with a technical lever: the mill automatically reduces its speed if the grain is damp, so the pulverizing hammers can squeeze out as much flour as possible. That flexibility reduces one kind of waste, but it can also trigger the other issue she sees. Importantly, Wanjiru says she is overall happy with the machine because it makes her business cheaper.

That “cheaper” is not vibes. Carr puts the economics on the table by comparing diesel-powered mills to solar-powered ones. In his account, about 40% of what shop owners who use diesel-powered mills charge customers goes toward paying for fuel. Operating Agsol’s solar-powered machine can be up to 80% more profitable once the initial cost, about $1,300, is paid off. The payback window, he says, is between six and 12 months. That is exactly the kind of range that makes investors and operators pay attention: not instant gratification, but fast enough to matter for a small business that cannot float cash for years.

This is happening in a country where Kenya has a stated goal that gives off-grid energy a clean political and regulatory storyline. Most of the power grid runs on renewables, but about 25% of communities lack centralized electricity. The national target is universal electricity access by 2030, and the logic is to reach that without driving up emissions. Off-grid solar slots into that plan because it can bypass grid expansion timelines and still align with low-emissions goals. And the source is clear that falling costs have helped the transition. A couple of years ago, a panel cost about $3 a watt. Now it’s down to cents. That price move changes everything for hardware companies building for places where grid connections are uneven.

There is another operational detail that quietly shifts demand, and it is the kind of thing boards sometimes underestimate until it hits revenue. Wanjiru likes that her mill can handle very small amounts of grain. That capability has brought a few new customers her way. In other words, the product is not only a fuel swap from diesel to solar. It also changes the “customer unit of purchase,” which can matter in low-income neighborhoods and informal markets where people may not be able to store large sacks of inputs. The mill sits in the middle of a compact shop. Around it, customers bring sacks and wait their turn. That physical workflow is where small technical constraints become cash flow.

Carr also has to convince not just one shop owner, but an ecosystem. Agsol launched its first product in 2018 in Kenya and has raised over $4 million of investment. Much of that capital came via a UK government program that supports clean energy projects in the region. Agsol sold 530 units last year, and orders have come from as far as Mozambique and Angola. For decision-makers, this matters because it signals two things at once: early traction in Kenya’s off-grid market, and exportable demand in neighboring regions where the same “not enough grid access” math tends to show up.

And then there is the jam problem, because every solar story eventually meets the messy world of grain variability. Wanjiru’s complaint is real: dampness can slow down milling, grain can get stuck, and jams can happen. Carr’s response is product behavior, not marketing. The mill reduces speed when grain is damp to maximize flour extraction, but that can lead to the very congestion she describes. That tradeoff is a reminder for anyone investing in energy hardware: the competitive advantage is often not “solar exists,” it is how quickly a system can adapt to conditions on the ground.

The strategic stakes are clear for executives watching off-grid energy companies, whether you are an operator building infrastructure, a board member overseeing risk, or a fund manager deciding where to allocate capital. When 25% of communities do not have centralized electricity, the winning products are the ones that can prove affordability fast, survive daily operations, and fit into local business models. Agsol’s pitch, backed by Wanjiru’s experience and Carr’s unit economics, is that solar-powered milling can be meaningfully more profitable than diesel. The question for competitors is whether they can close the same gap, and whether they can do it without trading one bottleneck for another.