Green energy

Traditionally, landfill gas is subject to thermal treatment utilising a flare stack. However, SITA UK has invested considerable time and effort in developing projects designed to convert the gas to generate electricity, harnessing the energy that would otherwise be lost as heat. We have established a specialist division, SITA Power, whose primary function is to establish as many projects for generation as is economically or environmentally possible within the shortest timescale. This is achieved through a combination of project routes, including in house projects and third party design, build and operate schemes.

Currently we have 21 sites generating power, 5 are under different stages of construction and there are 10 sites under design, evaluation or consideration. At present, installed capacity amounts to 58.5MW with a potential for a further 30MW.

Where possible waste heat from the generating engines is re-used on site for heating applications such as that required for leachate treatment. Where generation is not possible and flaring is required SITA has also installed systems to maximise heat recovery.

Landfill gas to energy is deemed a green energy and is supported and encouraged by a number of UK Government schemes. Where generation is not possible, SITA uses other treatment systems such as flare or bed oxidation to reduce the methane content of the landfill gas. This is considered beneficial within the remit of Global Warming.

As part of our environmental and economic responsibilities SITA UK will continue to explore other avenues to improve the efficiency of its generating schemes.