In short
- A Victorian dairy uses less than half of a roof-sized solar system, because milking runs before sunrise and after mid-afternoon. Sized to the midday load, the sums hold.
- Gippsland is AusNet Services; the Western District and the north are Powercor. Both limit exports on long rural feeders and single-wire lines, often to very little.
- Victoria is the only state with a standing commercial solar discount, and a dairy is a non-residential site, so Victorian Energy Upgrades is worth pricing.
Solar pays on a Victorian dairy, but a dairy needs a smaller system than its shed roof could hold, and in most of the state the network decides the size before the roof does. The two milking peaks fall outside solar hours. What the panels cover is the midday load: the vat compressor cycling, the plate cooler, water heating and pumps. On a long rural feeder in Gippsland or the Western District the network may cap exports close to zero, so anything past that midday load earns nothing. The general case for farms, including irrigation and sheds, is on solar for dairy farms and solar for farms.
| Quick facts | Dairy solar in Victoria |
|---|---|
| Distributor | AusNet Services (Gippsland), Powercor (Western District, northern Victoria) |
| STC zone | Zone 4, rating 1.185, for most of the state |
| State help | Victorian Energy Upgrades discount, 30kW–200kW, for non-residential sites |
| Share of solar used on site | about 45% for a roof-sized system; higher when sized to the midday load |
| What to send | one recent bill for each meter; we get the interval data from it |
What's different in Victoria?
1. Rural lines, and two distributors
Gippsland's dairies, from Warragul through Maffra to Orbost, are on AusNet Services. The Western District around Warrnambool, Colac and Camperdown, and the northern irrigation districts around Shepparton, Echuca and Cobram, are on Powercor. Both networks serve dairies on long feeders and, in many districts, on single-wire earth return lines, and both limit how much a connection can export to keep voltage stable.
- Up to about 30kW: a simpler process, but even here the export limit on a rural line can be small.
- Around 100kW: a full application with an export assessment. On a single-wire line the answer is often a tight cap or zero export.
- Several meters: most dairies have the shed, a pump and the house on separate connections. Each has its own limit and its own daytime load. Several smaller systems, each sized to its meter, often use more solar than one large system on the shed, and each claims the STC discount.
The Melbourne commercial solar page covers the metro networks; the rural rules are set by the same distributors.
2. STC zone 4 for most of the state
Gippsland and the Western District are zone 4, rating 1.185, the lowest on the mainland. A 100kW system installed in 2026 earns 100 × 1.185 × 5 = 592 certificates, rounded down; a 30kW system earns 177. Parts of northern Victoria fall in zone 3. The zone table is on the Clean Energy Regulator's site.
3. The Victorian Energy Upgrades discount
Victoria is the one state with a standing commercial solar incentive. Through Victorian Energy Upgrades, a non-residential site can get an upfront discount on a system between 30kW and 200kW, delivered by an accredited provider who creates certificates for the installation. The value moves with certificate prices. A dairy shed is a non-residential site; the house is not. Refrigeration and hot-water upgrades done at the same time may also attract certificates.
4. Milking times, and a cool climate
A Gippsland or Western District dairy milks from about 5am and again from about 3pm, with vat cooling and hot-water heating after each. Little of that overlaps with midday sun. The midday load is the vat compressor cycling and the plate cooler, which is why a system sized to that load uses most of its output and a roof-sized one doesn't. Victoria's cool climate means a lower refrigeration load than Queensland dairies, and about 1,250 kWh per kW a year from the panels, so the system is sized larger for the same output.
A worked example for a Victorian dairy
Here is a worked example with made-up figures. These are example figures, not our prices or a real site. The price is the one our commercial solar cost page uses for a 100kW system, before any Victorian Energy Upgrades discount.
- A 100kW system on a dairy shed, assumed to make about 1,250 kWh per kW a year, so about 125,000 kWh a year.
- The dairy uses about 45% of that, 56,250 kWh, because milking falls outside solar hours. The other 68,750 kWh would go to the grid, if the line allows it.
- At $0.28 for each kWh it no longer buys: 56,250 × $0.28 = $15,750. At $0.05 for exports: 68,750 × $0.05 = $3,438.
- Yearly saving $19,188. At an example price of $73,000 after the STC discount, that pays back in about 3.8 years.
If the network caps exports to zero, which is common on a single-wire line, the export line disappears and the saving falls to $15,750, a payback of about 4.6 years. Sized to the midday load instead, a smaller system uses most of its output and earns more per kW: each kW of the 100kW system earns about $192 a year in the capped case, while a system that uses 70% of its output earns about $245 per kW. The proposal should show both sizes with the sums, and the Victorian discount as its own line.
What to send
Just one recent electricity bill for each meter, every page. Using the meter number on each bill, we get that meter's interval data, which shows when the vat compressor runs, when milking peaks and what the midday load is. You don't need to request anything from your retailer.
Mention milking times, vat size, whether hot water is electric and which meters serve the shed, the pump and the house. Send a bill and an accredited installer prepares a costed proposal sized to the midday load on each meter. Already have a quote? Compare it line by line with our checklist, including whether it assumes exports the line can't take. A battery is worth testing on a dairy that can't export; see commercial solar batteries.