How many cattle could support a manure-to-energy project?
A large herd does not automatically mean a large energy resource. What matters is the manure reaching a collection system, its organic solids and the supply you can actually commit. Record animal numbers and collection conditions first, then compare energy routes and nearby demand without assuming commercial viability.
Calculate my herd's potentialWhy collection changes the answer
Australian reference examples use 0.25 kg of collected organic solids per cow/day for milking-shed-only pasture systems, 0.6 kg with a feedpad and 5 kg for fully housed dairy cattle. The organic solids determine energy potential; extra wash water does not create extra energy. [S1]
Choose the scale around your supply
Our default housed-cattle example gives roughly 101 kW of net CHP electricity from 1,000 cows. A 300 kg/day hydrogen reference would require about 1,863 equivalent housed cows under the same conversion assumptions. These numbers identify scale, not whether the investment will pay.
What about pigs?
Australian monitoring has measured useful gas recovery from piggery effluent. Start with animals by production stage and the organic solids reaching the pond. A sow, piglet and grower are not equivalent inputs. Use a herd-specific PigBal calculation or measured solids before converting pig numbers into energy. [A5, A10]
What we need from you
Average animals present, species and production stage; shed, feedpad or housing arrangements; collection frequency; storage; seasonal supply; electricity and heat demand; and any measured manure analysis.
From cattle numbers to a usable supply record
Record species, animals present, collection system and frequency. Where measured, retain collected wet mass, solids, storage time and analysis date alongside animal numbers. Do not add cattle headcount to tonnes or assume manure deposited across pasture is available to a plant.
Suppliers should distinguish available material from total manure generated. Developers seeking manure should specify the required material, quantity, period and acceptance conditions rather than treating an expression of interest as contracted supply.
Compare onsite energy with a shared processing route
A farm may value useful heat and electricity onsite, while a regional plant may need compatible co-feedstocks. Compare collection, pumping, storage, transport water, nutrient management and existing effluent obligations before choosing a route.
Food waste or FOG may be investigated as co-feedstocks, but the receiving digester must assess composition, dosing and operating limits. Additional incoming material does not automatically improve performance or establish saleable CO₂ or hydrogen.
Nearby farms are a starting point, not a hub verdict
Assess the volume actually collected at each site, seasonal consistency and a suitable receiving facility. Wet manure can be costly to move, so compare onsite processing and practical collection distances rather than assuming a regional radius is economical.
Save the resource privately and identify whether you offer feedstock, need feedstock or are exploring production. Reviewed publication can signal interest; equipment design, permissions and supply contracts remain separate qualification steps.
Frequently asked questions
Do these numbers apply to beef cattle, pigs or poultry?
No. Different animals and handling systems need their own collected-solids and yield inputs.
Can nearby farms combine supply?
Potentially. Compare collection cost, water content, transport, contracts and a shared use for the energy.
Sources and references
SADA, Feedpads and Contained Housing Guidelines
Queensland DPI, piggery biogas monitoring
Indicative operating-day examples
| Input | Raw gas (Nm³/day) | CHP electricity (kWh/day) | Recovered CHP heat (kWh/day) | Methane product (Nm³/day) | Recoverable CO₂ (kg/day) | Hydrogen alternative (kg/day) | BioLNG alternative (kg/day) |
|---|---|---|---|---|---|---|---|
| 1,000 pasture dairy cows, shed-only collection | 83 | 121 | 201 | 44 | 53 | 8.1 | 31 |
| 1,000 dairy cows, shed + feedpad collection | 200 | 290 | 483 | 106 | 128 | 19.3 | 75 |
| 1,000 fully housed dairy cows | 1667 | 2415 | 4026 | 882 | 1068 | 161 | 625 |
Indicative screening example. Actual output depends on feedstock testing, collection, plant design and operating conditions. CHP electricity and heat are one route; hydrogen and BioLNG are alternatives and cannot be added to the CHP or biomethane figures.
Compare my manure pathways
Save your quantities, location and evidence gaps privately. Nothing is published without your consent and Admin review.
Compare my manure pathways