One Stop Warehouse STC trading: what to ask

Written and checked by the Energy Merchants desk · Reviewed 2 October 2026

One Stop Warehouse (OSW) is known to most installers as a wholesale distributor of solar and storage equipment, so a search for “One Stop Warehouse STC trading” is really a question about a distributor that offers an STC service alongside its products. This page reports what OSW says, flags the limits of what we could verify, and explains how a wholesaler-with-trading differs from a dedicated certificate buyer.

What OSW says about itself

OSW’s website describes it as a wholesale distributor serving solar retailers and installers. Its STC trading page, titled “Convenient 1-Stop STC Trading” as indexed on 2 Oct 2026, describes an STC service for installers that it says it provides in partnership with an STC trading agent, GreenDeal. We could not retrieve the OSW pages directly (the server declined our request), so we are relying on the page as indexed and its wording may differ. Check the live page before you rely on any of this.

What we could not confirm

We could not confirm OSW’s fees, rates, payment times or the full terms of its STC service. We therefore say nothing about them. If you are considering it, ask OSW for the terms in writing, including who the buyer of your certificates is and whether the arrangement is separate from your equipment account.

A wholesaler with trading is a different model

When certificates are offered by the same business that sells you equipment, three things deserve a direct question.

• Who is the counterparty? If a third party handles the trading, you want to know who pays you and who carries the risk if a certificate is rejected.
• Is it linked to supply? Ask whether the STC terms depend on buying equipment from the same business.
• Can you take your certificates elsewhere? Check for any restriction.

None of this implies a problem. These are ordinary questions for any bundled offer, and the same questions apply to us. For the broader categories, see what an STC aggregator is.

Many former Greenbot clients moved mainly to Formbay and OSW; Greenbot alternatives explains what to check after a platform change.

Side by side

When a buyer on its own makes sense

Installers who buy equipment from several wholesalers often prefer one certificate buyer across all jobs, so the rate, the payment day and the contact are the same whatever the equipment. Energy Merchants works that way: a published daily rate on /pricing/, locked on lodgement of a complete claim, zero fees, 24-hour settlement for established partners (first claim 48-72 hours), a named account manager and a compliance desk that pre-checks every claim. Settlement is backed by REC Traders.

How to compare in practice

Send OSW and any alternative the same short email: your monthly volume by type, the payment day counted from a complete claim, every fee, and the lock point for the rate. Put the replies into the table. The certificate trader checklist offers twelve questions if you want more depth, and /switch/ covers moving work without losing claims in flight.

Next steps

For the tax side, see RCTI, GST and ABN for STC payments. Confirm OSW’s current terms from its own site and sales team, ask for them in writing, and compare net dollars and dates. If you want our numbers to compare against, see today’s rate or start trading.