Size modular and centralised bioenergy configurations.

Modular bioenergy design matches equipment capacity and expansion interfaces to dependable throughput, customer demand and realistic utilisation. Compare modular and centralised configurations on the same delivered-output basis, including collection, processing, utilities, storage, transport and servicing. Smaller packages are not automatically cheaper; sizing and configuration must follow the site’s technical and commercial evidence.

Two modular digesters beside gas equipment and delivery tanker
Conceptual illustration · not a project photograph or engineering design

Size equipment around secure supply and useful output

Establish the reliable throughput and customer demand profile before selecting a package. Check peak and average loads, feedstock variability, process retention requirements, utilities, storage and supplier operating limits. A smaller unit may match local quantities; a centralised plant may spread fixed costs but add collection distance. Capacity should follow a supported operating envelope, not the largest resource estimate.

Design the next stage before committing to it

Allow for expansion space, utilities, controls and storage where justified. Establish triggers such as additional contracted feedstock or customer demand. Staging should manage risk; it should not depend on assuming future buyers will appear.

Share services selectively

Producers can retain local facilities while coordinating maintenance, laboratory testing, transport or commercialisation. Shared upgrading and delivery require clear quality, ownership, scheduling, payment and interruption arrangements. Model individual participation costs and who carries unused capacity.

Learn from a documented network

IEA Bioenergy’s 2017 Wijster Green Gas Hub case describes producers supplying treated biogas to shared upgrading, with a CO₂ horticultural-use component. It illustrates one configuration for linking producers and customers. Its historical Dutch conditions are not an Australian cost benchmark. [[ IEA Bioenergy Task 37, Green Gas Hub, Wijster ](https://task37.ieabioenergy.com/case-success-stories/green-gas-hub/)]

Include local capability

Repeatable equipment and servicing needs can create opportunities for Australian fabrication, assembly and maintenance. Shelby recommends testing demand, supplier capability and quality requirements before making manufacturing or employment claims.

Compare modular versus centralised configurations

Compare standalone modular production, shared processing and a larger central plant on the same delivered product, utilisation and emissions boundary. Include collection, preprocessing, duplicate utilities, interconnection, backup capacity, transport and servicing. The value is in choosing the configuration that works under local conditions - not assuming modularity is always preferable.

Identify candidate regions before sizing a site. Once the equipment case is evidenced, use staged regional rollout to consider replication and Project Development to plan specialist work.

Frequently asked questions

Are modular plants always more efficient?

No. Technical efficiency and delivered economics depend on the configuration, utilisation and supply chain.

Does a shared network need physical gas pipelines?

Not always. It may involve shared logistics, maintenance or sales; describe the actual services rather than implying a pipeline.

When should a project expand?

When additional verified supply, demand, infrastructure and finance support the next stage.

Sources & References

  • International Energy Agency (IEA), Outlook for Biogas and Biomethane

    Publication: 2025-05-28

    Observation period: 2025 report; modelled costs are not Australian supplier quotations

    Relevant page / section: Assessing the sustainable potential and cost of feedstocks for biogas and biomethane

    Last link / title verification: Not verified (check attempted 2026-10-11)

    Verification incomplete, do not rely on this reference for an investment or approval decision.

    High for analytical framework; modelled international costs are not Australian quotes

  • IEA Bioenergy Task 37, Green Gas Hub, Wijster

    Publication: 2017-04

    Observation period: April 2017, contributor Attero. Checked 10 October 2026. Shared local upgrading example; not evidence of current Australian hub costs.

    Relevant page / section: Historical configuration case study

    Last link / title verification: 2026-10-11

    Publisher link checked; individual claims, costs and regulatory applicability still require review.

    2017 contributor case study: not current Australian project costs or an independently audited operating benchmark.

  • Shelby Bioenergy, Shelby’s National Renewable Gas Policy consultation response

    Publication: 2026-10

    Observation period: October 2026

    Relevant page / section: Supplied company position

    Last link / title verification: Not verified

    Company position / supplied material, not independent evidence.

    Proposals and scenarios, not adopted policy or market offers.