Solar Mills Save Kenya Shop Owners 80% on Costs

Milcah Wanjiru runs a small shop on the outskirts of Nairobi where neighbors bring corn to mill into flour for ugali, a staple Kenyan dish. But unlike most grain mill operators in her community, she doesn't spend a penny on diesel fuel.

Her mill runs entirely on solar power, making her business dramatically more profitable. Traditional diesel-powered mills eat up 40% of what shop owners charge customers just to cover fuel costs. Wanjiru's solar mill, once paid off, can be up to 80% more profitable.

The machine comes from Agsol, a Nairobi-based company that launched its first solar mill in 2018. Founder Matt Carr designed the technology specifically for small shop owners like Wanjiru who serve low-income neighborhoods across Kenya and rural areas where diesel mills are the norm.

The timing couldn't be better for Kenya's clean energy goals. While most of the country's power grid already runs on renewables, 25% of communities still lack centralized electricity. Kenya aims to deliver universal electricity access by 2030 without increasing emissions, and off-grid solar solutions are key to that mission.

The economics of solar have improved dramatically in recent years. A solar panel that cost around $3 per watt just two years ago now costs mere cents, making products like Agsol's $1,300 mill accessible to small business owners. Most operators break even within six to twelve months.

Wanjiru appreciates another unexpected benefit. Unlike diesel mills that need large batches to run efficiently, her solar mill can handle very small amounts of grain. That flexibility has brought new customers to her shop, people who might only need a small quantity milled at a time.

The Ripple Effect

Agsol has now raised over $4 million in investment, much of it through a UK government program supporting clean energy projects in the region. Last year alone, the company sold 530 units and has received orders from as far as Mozambique and Angola.

Each solar mill represents a small business becoming more profitable while eliminating diesel emissions from the community. For neighborhoods where grid electricity remains years away, these off-grid solutions prove that clean energy and economic opportunity can arrive together.

As Carr visits Wanjiru's shop to gather feedback, she points out that damp grain sometimes jams the machine. He explains it's designed to slow down automatically to extract maximum flour, but promises to keep improving the design based on real-world use.

For now, Wanjiru returns to her next customer, scooping mung beans onto a scale while her solar-powered mill stands ready for the next batch of corn.