Renewable Energy Data Centres: Power Contracts, PUE and Proof

Why renewable sourcing is now a buying question

Renewable energy used to be a line in a brochure. For many Australian buyers it is now part of the paperwork. Mandatory climate-related financial disclosures began for the largest entities with financial years starting on or after 1 January 2025, and the second group of reporting entities comes in for financial years starting on or after 1 July 2026. Those reports include Scope 2 emissions, which cover the electricity your colocated equipment uses. Even if your business is not in a reporting group, your larger customers may be, and they increasingly ask suppliers for energy data. So the question is shifting from "is this facility green?" to "what renewable electricity sits behind my share of this facility's power, and can I prove it?"

Our guide to green data centre claims covers efficiency ratings such as NABERS. This guide focuses on the power itself: where it comes from, how it is contracted, and what it means for your bill.

How data centres source renewable electricity

Electricity from the grid cannot be traced back to a particular wind farm, so renewable claims in Australia rest on contracts and certificates. The main routes are:

• Power purchase agreements (PPAs). A long-term contract with a specific wind or solar project. It can be physical, with the energy supplied through a retailer, or financial, where the price is settled against the wholesale market and the certificates pass to the buyer. • Large-scale Generation Certificates (LGCs). One LGC represents one megawatt-hour of eligible renewable electricity under the Large-scale Renewable Energy Target. Voluntarily surrendering LGCs lets a buyer claim that renewable electricity. The Renewable Energy Target ends on 31 December 2030. • Renewable Electricity Guarantee of Origin (REGO) certificates. A newer scheme run by the Clean Energy Regulator that began on 3 November 2025 and continues beyond 2030. Each certificate represents one megawatt-hour and records the source and when the electricity was generated or dispatched, including from storage. A facility cannot create both an LGC and a REGO for the same electricity. • Accredited GreenPower bought through an electricity retailer. • On-site solar, which is welcome but usually covers a small share of a data centre's demand.

The useful question is not which route is "best". It is whether the certificates behind a claim are actually retired or surrendered, so the same renewable electricity is counted only once, and whether any of it is allocated to you.

How grid mix varies by state

Location still matters. Scope 2 emissions can be calculated two ways: a location-based method that uses the emissions intensity of the grid where your equipment sits, and a market-based method that reflects the contracts and certificates you hold. Under Australia's climate disclosure standard, AASB S2, entities must report Scope 2 emissions using the location-based approach, and can add information about contractual instruments such as certificates. A strong renewable contract does not change your location-based figure.

The National Electricity Market connects Queensland, New South Wales and the ACT, Victoria, South Australia and Tasmania. Western Australia's main grid and the Northern Territory's grids are separate systems. Their generation mixes differ a lot. Tasmania's supply is dominated by hydro and South Australia gets a large share from wind and solar, while the other mainland grids still rely more on fossil fuels, although that is changing as new renewables and storage connect. The Australian Government publishes state-by-state emissions factors each year in the National Greenhouse Accounts Factors, which most location-based calculations use.

In practice, a rack in Hobart or Adelaide can carry a very different location-based footprint from a rack in another capital, before any contracts are considered. If that matters for your reporting, weigh the state alongside latency, resilience and price. Our city-by-city guide compares the main locations.

Annual matching versus hourly matching

Most renewable claims are annual: the operator retires enough certificates to match a year of consumption. That is a recognised approach, but it does not mean the facility runs on renewable power at 2am on a still winter night.

Some large buyers now ask about time-matched, or hourly, renewable supply, where renewable generation is matched to consumption hour by hour. Because REGO certificates record when the electricity was generated, time-based claims are becoming easier to evidence. Hourly matching is harder to deliver and less common, so treat it as a question to ask rather than something to expect by default.

How renewable sourcing affects pricing

In Australian colocation, electricity is usually either bundled into a per-kW price or passed through based on metered use. Our guide to colocation costs explains both. Renewable sourcing tends to appear in one of three ways:

• Included. The operator covers the whole facility and does not charge separately. • Optional add-on. You pay a premium to have your consumption matched and certificates retired on your behalf. • Pass-through. Certificate costs are passed through with energy charges, so they move with the certificate market.

Certificate prices change over time, so ask whether any renewable charge is fixed for the contract term or can be reset. And do not overlook efficiency. Where energy is charged on metered use with a PUE (Power Usage Effectiveness) multiplier, a lower measured PUE reduces both the energy you pay for and the emissions attached to it, whatever the source. Our guide to data centre power explains how power is reserved and billed.

Evidence to request from providers

Add these questions to your request for proposal:

1. Which mechanism (PPA, LGCs, REGOs, GreenPower or on-site generation) covers this building, and what share of its annual consumption does it match? 2. Are the certificates retired or surrendered, by whom and in whose name? Can they be allocated to our deployment? 3. What period does the claim cover, and is it annual or time-matched? 4. Can you provide monthly metered energy data for our racks for Scope 2 reporting? 5. How is any renewable charge priced, and is it fixed for the contract term? 6. What was the measured annual PUE for this building, and does it hold a current NABERS rating? 7. Has an independent party reviewed or audited the claim?

Record the answers side by side in the comparison tool and look up operators in the provider directory.

Ready to compare renewable options?

Renewable sourcing is one factor alongside location, power density, resilience and price. DChunt's free assessment lets you flag renewable energy and reporting requirements, so your shortlist is made up of operators that can back their claims with documents. DChunt is independent and does not resell data centre space.