Chairman Martin Kruus of Nelja Energia. Photo: Patrik Rastenberger

Chairman Martin Kruus of Nelja Energia. Photo: Patrik Rastenberger

Current manure treatment at the cattle farm in Oisu. Photo: Patrik Rastenberger

OÜ Estonia's Farm Manager Aive Hommik. Photo: Patrik Rastenberger

The cattle farm OÜ Estonia in Oisu has some 1,000 cows. Photo: Patrik Rastenberger

Chairman Martin Kruus of Nelja Energia. Photo: Patrik Rastenberger

Oisu municipality has some 400 inhabitants. Photo: Patrik Rastenberger

The local farmers will get revenues from the biogas project. Photo: Patrik Rastenberger

Pakri wind farm in Paldiski, Estonia. Photo: Patrik Rastenberger

The veterinary visits Oisu cattle farm. Photo: Patrik Rastenberger

Every cow produces some 6 tonnes of manure per year. Photo: Patrik Rastenberger

Oisu cattle farm delivers milk to Tartu. Photo: Patrik Rastenberger

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