Biogas Chiller Extends Milk Shelf-life for 14 Hours

Published: May 12, 2016

By Laban Robert for FarmBiz Africa

About Powering Agriculture

Powering Agriculture: An Energy Grand Challenge for Development supports the development and deployment of clean energy innovations that increase agriculture productivity and stimulate low carbon economic growth in the agriculture sector of developing countries to help end extreme poverty and extreme hunger.

With dung from three dairy cows, a farmer can now extend shelf-life of their milk for more than 10 hours with a biogas-powered chiller, allowing for more time that milk will remain fresh while awaiting marketing.

The SimGas Milking Chiller uses biogas energy from organic matter like cow dung to reduce the temperature of the produce to between 4?C and 6?C within four hours.

Low temperatures reduce micro-organisms activity, therefore, keeping the milk fresh for long.

Dr Ryan Shelby of USAID’s Powering Agriculture says the kit can comfortably be fueled by gas generated by three dairy cows to refrigerate 10 litres of milk for 14 hours.

SimGas Milking Chiller is particularly helpful to farmers who cannot dispose of milk in the evening.

“The chiller reduces the temperature of milk from 37 degrees Celcius to less than 6 dgrees Celcius. This is sufficient in boosting marketing time for farmers especially when they want to sell the evening produce the following morning,” Dr Shelby says.


Milk is highly perishable. Farmers lose more than 30 per cent of their produce when there is no ready market.

Farmers in regions like Rift Valley and central pour down the milk when in plenty and the market cannot absorb the excess. Poor hygiene accelerates the rate of going bad. These among other causes lead to massive losses to farmers.

Crude Dealers

Some crude farmers and dealers resort to adding hydrogen peroxide to extend freshness to meet freshness until the milk reaches urban markets like Nairobi.

This is particularly dangerous because addition of the preservative is not monitored.

Kenya Dairy Board says more than 70 per cent of between 100,000 litres and 200,000 litres of raw milk transported to Nairobi daily is locally ‘treated’ with this chemical for preservation.


But the SimGas Milking Chiller gives hope to farmers, who will have more time to sell their milk as well as convert cow dung into energy for refrigeration and cooking.

A maximum of one mitre cubic gas is required to power the chiller for an entire day while the excess can be used in cooking.

Handsome Savings

One litre of milk in Kenya is sold at about sh60.

Dr Shelby, who is the program manager for Powering Agriculture: An Energy Grand Challenge for Development, says a farmer would cumulatively save about Sh800 per day with this biogas.

A farmer requires Sh50,000 for installation of the biogas and the chiller. The equipment is sold by SimGas in Kenya.

Related News & Events: 
Apr. 17, 2019

Promethean continues to grow their milk chilling business in India. Using thermal batteries, the tank-based system eliminates the costs associated with using diesel generators, along with GHG emissions.

Sep. 12, 2018

Congratulations to SimGas! They took home the prize for the Innovative Technology category at the prestigious 2018 Climate & Clean Air Awards. They were recognized for their revolutionary, high-quality and affordable biogas systems, which have tremendous positive impact on climate and health.

Aug. 24, 2018

Congratulations to SimGas! They've been chosen as a finalist for the 2018 Climate and Clean Air Award. This award recognizes exceptional contributions toward reducing short-lived climate pollutants, which contribute about 40% of the manmade heat energy being added to the planet every year.

SimGas is 2018 ASME Innovation Showcase Winner in Kenya
Jul. 23, 2018

The Biogas Milk Chiller by SimGas enables off-grid dairy farmers to store, deliver, and sell the highest possible quality and quantity of milk. Milk is kept cool overnight until it is delivered/sold the next day. This decreases milk spoilage and increases income potential for dairy farmers.