In the early 19th century, animals were the chief source of power in farming. Later in the century, steam power gained in importance. During World War I gasoline- (petrol-) powered tractors became common, and diesel engines later became prevalent. In the developed countries, the number of farm workers has steadily declined in the 20th century, while farm production has increased because of the use of machinery.
Power supply may be considered as autonomous at different levels: at local on-farm level, at local co-operative level or at national level. At local level autonomous power supply may be defined as that power which is generated on-farm for local on-farm use.

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In the early 19th century, animals were the chief source of power in farming. Later in the century, steam power gained in importance. During World War I gasoline- (petrol-) powered tractors became common, and diesel engines later became prevalent. In the developed countries, the number of farm workers has steadily declined in the 20th century, while farm production has increased because of the use of machinery.
Power supply may be considered as autonomous at different levels: at local on-farm level, at local co-operative level or at national level. At local level autonomous power supply may be defined as that power which is generated on-farm for local on-farm use.

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