They are the future of farming, according to some in the industry.
Anaerobic Digesters, or AD plants, use waste product to produce electricity. On a dairy farm they use slurry to keep it running.
Iain Service is building a dairy farm near Newton Stewart, and the AD plant was built into the design from the start.
The AD plant works like a stomach, using bacteria to break down the slurry to produce methane gas, that is then burned to produce electricity.
It is green energy on a constant basis, unlike wind turbines the digester should not be shut down.
Feed in tariffs to help famers install the plants have now been reduced by the UK Government by 20 per cent. NFU Scotland are worried that is likely to stall the positive impact that AD plants could have on Scottish farms.
Iain integrated the AD plant into his new farm because he is resolute that the technology should be given a chance.
Anaerobic Digesters are still a very new technology but NFU Scotland are determined that they could play a massive part in the industry's future.