Farmers use the cleaner, cheaper fuel - which requires no extra land to grow its feedstock - to run irrigation pumps, making them less vulnerable to poor rains
The farmers earnings had doubled in the two years they have been pumping water using biodiesel, which is both more efficient and 20 shillings ($0.20) per litre cheaper than regular diesel.
The biodiesel they are using is also good news for the planet.
Unlike most biofuels, which are derived from crops such as maize, sugarcane, soybean, rapeseed and jatropha, it is made from a byproduct of the cotton-making process.
That means that as well as being cleaner and cheaper than regular fuel, it is more sustainable than other biofuels because no extra land is needed to produce it.