IN Brief:
- CIS Tender 11 seeks an indicative 1.8GW of generation capacity in Western Australia's WEM.
- Registrations opened on 25 August, with successful projects expected to be announced in March 2027.
- At least 180MW is reserved for qualifying projects offering First Nations equity or revenue sharing.
Australia’s Capacity Investment Scheme has opened registrations for a tender seeking an indicative 1.8GW of new renewable generation in Western Australia’s Wholesale Electricity Market, with successful projects expected to be operating by 2030.
CIS Tender 11 opened for registrations on 25 August, with formal bid submissions beginning on 27 August. Registrations close on 8 October, bids close on 22 October, and successful projects are expected to be announced in March 2027.
The round is likely to be the final generation tender for the Western Australian market under the current Capacity Investment Scheme if the remaining programme targets are met. It follows earlier Western Australian CIS awards covering 1.9GW of renewable generation and 482MW of storage across ten projects.
Tender 11 also introduces a stronger test of developer capability. Proponents must have commenced assessment under the Australian Government’s Developer Rating Scheme before applying, adding a formal measure of developer performance and conduct alongside the technical and financial merits of the proposed power project.
That requirement reflects one of the recurring problems with generation pipelines: awarded or announced megawatts are not the same thing as operating capacity. Projects can stall because of financing, grid access, land arrangements, permitting, equipment lead times, contractor capacity, or community opposition long after an initial commercial decision has been made.
The tender therefore places additional emphasis on whether projects can attract finance and proceed to construction. For the power system, that distinction is crucial. A nominal 1.8GW target improves reliability only when enough of the successful schemes reach commissioning on the required timetable.
A minimum 180MW of the tender is also allocated through an optional First Nations Equity and Revenue Sharing Set Aside. Projects seeking capacity through that route must offer at least 5% First Nations equity participation or a comparable revenue-sharing arrangement and still pass the wider qualification and merit assessment.
Capacity awarded through the set-aside counts towards, rather than on top of, the overall 1.8GW target. The mechanism therefore changes how part of the procurement is allocated without increasing the headline volume of generation sought in the round.
Successful projects will also be required to participate in Western Australia’s Reserve Capacity Mechanism. That matters because the WEM has to procure sufficient dependable capacity to meet periods of peak demand even as a growing proportion of annual energy comes from variable wind and solar generation.
Installed generation capacity and dependable capacity are not identical concepts. A wind or solar plant may carry a large nameplate rating but cannot guarantee that its full output will be available during the system’s highest-demand interval. Capacity mechanisms attempt to account for that difference by valuing the contribution resources can make to reliability under defined conditions.
Western Australia’s system also operates separately from the interconnected National Electricity Market in eastern and southern Australia. That makes local capacity, network constraints, and system flexibility particularly important because the WEM cannot rely on very large inter-regional electricity transfers from the NEM when supply conditions tighten.
The new renewable generation therefore has to arrive alongside sufficient storage, dispatchable resources, transmission, and network services. Previous CIS rounds in Western Australia have included battery projects as well as wind and solar, while two projects totalling 250MW from an earlier dispatchable-capacity round have signed agreements and begun construction.
Grid connection will be one of the practical filters on Tender 11 bids. Western Australia’s strongest renewable resources do not always coincide with available transmission capacity or major loads. New generators require connection studies, protection and control systems, transformers, switching infrastructure, and adequate network capacity before nameplate megawatts can become usable system supply.
Equipment procurement creates another layer of timing risk. Utility-scale wind and solar projects require large quantities of transformers, switchgear, cable, inverters, towers, modules, turbines, and other electrical equipment, much of it ordered well before construction reaches the commissioning stage. Delays in a single high-voltage transformer or grid connection package can hold back an otherwise completed plant.
The Developer Rating Scheme does not solve those engineering constraints, but it gives the tender administrator another means of judging whether the organisations bidding for support have a credible route through them. Combined with financing requirements and the Reserve Capacity Mechanism, it shifts some attention from the headline cost of renewable power towards the likelihood that the project can actually be delivered.
Registrations are now open; the more revealing stage begins when the bids arrive. Western Australia is not short of proposed renewable capacity. Tender 11 is designed to decide which 1.8GW of that pipeline is most likely to survive procurement, construction, connection, and commissioning in time to become useful power-system infrastructure by 2030.
