Case study
Uilenkraal Farm, Darling, South Africa
The first heated and mixed in-ground sequential bio-digester in Southern Africa
13 GWh over project lifetime
>4,200,000 tons of avoided CO2
99% Up-time
500 kVa Installed generator capacity
Bio-digester design capacity 750 kVA
2 x 250 kVA naturally aspirated engines
Built in-house
22-litre V-12 engine
Electrical efficiency 32.5%
Plant specification
200 - 350m3 fed per day
Feedstock - cow manure and dairy wash water (1700 cattle)
3% to 7% total dry solids
20 to 30 day Retention time
>7,200m3 digester slurry volume
Heated and mixed in-ground sequential bio-digester
Integrated biogas storage capacity > 6 MWh
Bio-digestion characteristics
Plant performance
10 years in operation
Total energy generated over system lifetime: 13 GWh
(Farm load tracking uses <60% of capacity and biogas)Plant availability = 99%
Engine availability = 97%
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