Efficient cook stoves in developing countries.

The Global Energy Assessment reviewed 51 programmes, conducted since 1980 in 8 Asian, 12 African and 9 Latin American countries, whose aim has been to distribute clean cooking stoves to poor households. Included in the review were costs, efficiency and technologies used. The review highlighted the wide range of cooking-stove models tailored to local needs, fuel supply, available technical skills and affordability. Energy efficiencies ranged from 15 per cent for simple mud stoves running on straw and twigs (several thousands of which were constructed by trained artisans in Viet Nam at a cost of $1.8) to as high as 40 per cent in the case of a programme in China involving 300,000 clay stoves running on coal briquettes and constructed in local workshops since the 1980s. There was no evidence of systematically increased efficiencies or reduced costs over time. Programmes in Latin America tended to be smaller in size, but were mostly subsidized to varying degrees, including 100 per cent in some cases in Guatemala, Bolivia (Plurinational State of) and El Salvador, whereas in Asian and African countries, there was a wide range of subsidy levels, depending on the type of clean cooking stove. Noteworthy are the large-scale programmes designed to distribute since the 1990s more than 5 million Chulha stoves, running on a range of fuelwood, straw, dung and agricultural waste, with efficiencies between 20 and 28 per cent, and delivered at costs of only $1.80-$4.60, depending on the subsidy levels (which ranged from zero to 78 per cent subsidy). Manufactured metal stoves in India, Zimbabwe, Rwanda, Mali, the Niger, Burkina Faso and Guatemala, were about 10 times more expensive than Chulha stoves, but typically achieved efficiencies that were somewhat higher—close to 30 per cent.