Early in the morning, we left our hotel to our first company visit that headed us to MTN (Mobile Telecommunication Network). MTN is one of the biggest Mobile telecommunications operator in South Africa. After a warm welcome at their head office campus in Fairland, Johannesburg, we were introduced to their most pioneering innovation, that is far away from MTN's core business and was developed by the company over the past few years. As the insufficiency of electricity supply is one of the biggest problems in South Africa, MTN started to invest in developing alternatives to the classical electricity production. The result is a R22-million, 2-MW trigeneration plant powered by methane gas. This trigerneration plant is not only generating electricity from the methane gas, but also use a by-product of the cooling process: The 400 ºC exhaust gas is sent through lithium bromide absorption chillers to cool water, which MTN uses for the cooling needs in the building (mainly for the in-house data center). This whole process achieves the impressive effectiveness of 85%! This form of methane gas transformation is brand new and MTN was able to save the patents on it. The company now still evolves in the transformation technology and plans to apply for a license which allows it to provide electricity to other consumers - so to sell electricity and thus, enter in the electricity market. Besides the methane gas transformation, MTN developed another solution for electricity production: On the rooftop of the company's building, they installed a concentrating solar cooling system to cool down their data center. Solar mirrors tracking the sun by the use of GPS generate pressurized hot water which is then used to power an absorbation chiller that produces cold water. The mirrors are that smart, that they are able to turn themselves downwards the ground in case the sun is not shining, so that they are protected from rain and pollution. The visit at MTN was quite surprising and inspiring. The company demonstrates impressively how a new revenue stream can be developed based on a global South African problem. MTN allowed us to explore their data center, the methane gas transformation engines and the mirror installation at the rooftop. Two of the responsible engineers - Luan and Ivan - never got tired to answer all our questions and provided unique insights to us. photo & text by Murielle














