Queensland Farm Solar and Irrigation Pumping: Tariffs, Export Limits and SWER Realities

A Queensland farm is not a house with a bigger roof, and it is not a warehouse either. It is heavy daytime loads spread across a property — irrigation pumps, bore pumps, packing sheds, cold rooms, workshops and grain storage — connected, very often, to a long rural line with strict limits on what can be sent back to the grid. That is why farm solar Queensland projects need a different design conversation from residential solar.

The central idea is simple: on a farm, the pump is the solar load. Irrigation pumping happens during the day, when the sun is shining, so solar generation and the farm's biggest load naturally line up. A farm that pumps while the sun shines can use most of its solar on site — so the export limit, the feed-in tariff and the battery question matter less than a residential installer might assume.

This guide is written for Queensland farmers and farm managers — cotton, grain, dairy, horticulture and cattle producers — weighing up solar for irrigation pumping, bore pumps, sheds and cold storage. It covers pumping hours, starting currents, supply types, SWER lines, connection rules, the 30 kW feed-in cliff, dynamic export, diesel and off-grid bores, the expanded scheme for systems up to 1 MW, storage, and what a farm solar quote must show. EServices4U is based in Queensland and serves clients Australia-wide. Where a figure, rebate or rule is time-sensitive, the guide says so — confirm it on your own connection approval or quote before relying on it.

Why farm solar is a pumping job first

A farm's load follows the season, the crop and the weather: irrigation pumps that run hard for weeks during a dry spell and then sit idle, bore pumps on a duty cycle, packing sheds and cold rooms that run through harvest, and workshops and grain storage that run at particular times. A cotton farm solar Queensland project runs large irrigation pumps in long daytime blocks through the season; a dairy solar Queensland project runs milk cooling and vacuum pumps twice daily, overlapping solar hours only partly; horticulture runs packing shed refrigeration through the day and into the evening; cattle properties run stock bores in short bursts on tank demand.

Irrigation solar Queensland inquiries most often start with two questions: how big a system do I need, and what will I earn for the power I export? The first is the right one. On a farm that pumps during the day, most of the value is in the electricity not bought from the grid, not in the electricity sold back to it. The export arrangement still matters — it sets a ceiling on system size — but a business case built mainly on export income is built on the weakest leg. The strongest cases are built on daytime self-consumption. The starting point for any farm solar design is therefore not the roof. It is the pumping schedule.

Matching solar generation to daytime pumping

Solar panels generate most between roughly 9 am and 3 pm, with a peak around midday. The farm's job is to put load under that curve. Irrigation pumping is one of the best loads for this, because a pump can often be scheduled to run through the middle of the day. Where the crop and the water licence allow it, shifting pumping into solar hours is worth more than any battery, because it uses solar power directly, with no conversion or storage losses.

Run the pump when the sun is up: many farms pump at night because the tariff was cheaper overnight, or because that is when the water order arrives, or simply because that is how it has always been done. A solar system changes that arithmetic: night pumping on solar means buying grid power at night or storing solar power in a battery to run the pump after dark — both of which add cost. Ask the designer to show the pumping schedule against the solar generation curve for a representative irrigation week.

Size from pump duty, not from roof area: farm sheds often have large roofs, and it is tempting to fill them. But a system that generates far more than the farm can use at midday will export the surplus, and on many rural Queensland connections the export limit is small. The right size follows the daytime load: the pump's power draw, the hours it runs, the other daytime loads in the shed and cold room, and the export limit on the connection approval. Get interval meter data — half-hourly consumption across a full irrigation season — and make the designer model against it.

Think in energy as well as power: a pump's power rating in kilowatts tells you how fast it draws energy; the hours it runs tell you how much energy it needs. A published farm solar guide (published 24 August 2026, updated 28 September 2026) gives a useful illustration: a 5.5 kW pump used for four hours needs about 22 kWh before losses. That is a guide illustration, not a sizing rule for your pump — bore depth, head, flow rate and pump efficiency all change the numbers. Ask for generation and consumption modelled month by month, and for the design to state what happens in the months the pumps run least: how much solar is exported, at what rate, and whether the export limit causes the system to curtail.

Pump starting currents and variable-speed drives

A pump is a motor, and motors behave differently at start-up from the way they behave once they are running. This is one of the most common technical traps in solar pumping Queensland projects.

Starting current is much higher than running current: a pump motor can draw several times its normal running current for a brief period when it starts. On a solar-and-inverter system, the same surge has to be supplied by the inverter, the battery if one is present, or the grid connection — and the inverter's rating is the constraint. An inverter sized neatly for the pump's running power may trip, fault or refuse to start the pump at all. Ask the designer to state the pump's starting current, the inverter's surge or overload rating, and how the combination has been verified.

A variable-speed drive changes the problem: a variable-speed drive (VSD) ramps the pump motor up gradually instead of switching it on at full power, which reduces the starting surge and gives the farmer control over flow rate. A VSD also allows the pump to follow the sun. But a VSD introduces harmonics and can affect power quality, and it must be compatible with the inverter and the network's requirements.

Direct solar pumping is a different design: some remote bores use panels feeding a pump controller, with the pump running only while the sun shines and water stored in a tank or dam — no grid connection and no battery. If your bore is remote, ask whether this option has been priced separately. Verify the cable route and size and who is responsible for the pump-side electrical work, in writing before construction.

Three-phase versus single-phase on the farm

Many Queensland farms are supplied single-phase, and many run three-phase equipment — or would like to. A single-phase connection can run smaller pumps, but large irrigation pumps are usually three-phase machines. A farm on single-phase supply that wants to run a large three-phase pump has options — a three-phase supply upgrade, a phase converter, or a VSD that converts single-phase input to three-phase output for the motor — but each has a cost, a limit and a design consequence. A VSD that synthesises three-phase power is a legitimate solution for some pump sizes, but it is not a substitute for a proper three-phase supply for a large irrigation pump.

Queensland grid connection rules, current as of September 2026 according to published connection guidance, allow a larger total inverter capacity on a three-phase connection than on a single-phase connection — 10 kW per phase, or 30 kW in total, on a fixed three-phase connection, against 10 kW in total on a fixed single-phase connection. But the per-phase balance matters too: an unbalanced installation can cause voltage and export problems even when the totals look right. Ask the designer to show the per-phase allocation of solar, load and export, not just the totals.

Verify the supply type and capacity at each point of connection on the property, the main switchboard and busbar ratings, and whether a supply upgrade is needed — and whether it is included in the quoted price.

SWER lines: the 2 kW fixed export reality

A large part of rural Queensland is supplied by Single Wire Earth Return (SWER) lines — long, single-conductor lines that serve scattered farms and homesteads across great distances. SWER is the most constrained type of connection a farm solar system can meet. For any SWER solar farm project, the SWER rules set the ceiling on what a system can do.

Fixed export on SWER is 2 kW: under the published Queensland grid connection rules current as of September 2026, a SWER connection on a fixed export arrangement allows 10 kW of total inverter capacity, but only 2 kW of export. A farm on a fixed SWER connection that installs a large solar array will use what it can on site during the day and export at most 2 kW — the rest is curtailed, or never generated at all. For a farm whose main value is daytime self-consumption, 2 kW of export may not matter much — but for a farm whose business case depends on selling surplus power, it matters enormously.

A dynamic connection lifts the export ceiling: the same published rules show a different picture for a SWER dynamic connection — 15 kW of solar plus 15 kW of battery, with export of up to 10 kW. That is a materially better export outcome, but a dynamic connection requires equipment and a control arrangement that lets the distributor vary the export limit, and the published figures include a battery inverter as part of the arrangement. A quote that shows a large array on a SWER line should state plainly whether the connection is fixed or dynamic and what export limit applies. Do not accept a design that assumes dynamic export without a dynamic connection approval.

Voltage rise is the reason: a long rural line has higher impedance than a short urban one, so exporting power raises the voltage at the farm end more sharply. If the voltage rises too high, the inverter must disconnect or reduce output to protect the network and the farm's own equipment. That is why the export limit is small on SWER and why a dynamic connection, which can reduce export when the network is under stress, can safely allow more. Ergon Energy publishes a Network Capacity Map showing local network capacity — check the map for your area before assuming any export figure.

Ergon Energy or Energex: who connects your farm

A Queensland farm connects through one of two distributors, and which one applies depends on where the farm sits. Energex supplies South East Queensland. Ergon Energy supplies the rest of the state: regional, rural and remote Queensland, including most of the cotton, grain, cattle and horticulture country where irrigation solar matters most. The distributor, not the retailer and not the installer, approves the connection and sets the export limit. That approval is the single most important document in the project.

The connection application settles the export limit: no sales proposal, however detailed, can promise an export limit. Only the distributor's connection approval can. For larger farm systems, the distributor will want to know the inverter capacity, the export limit, the battery arrangement, and whether the system can be controlled or curtailed. Larger systems may face zero-export or limited-export requirements, dynamic export arrangements, or specific protection and control equipment. Verify the approved export capacity and any curtailment arrangement on the connection approval itself, and model the return on that figure.

Get the approval before signing the construction contract: a farm that signs a construction contract and then discovers the connection approval allows only 2 kW of export, or requires a negotiated connection with additional equipment, has lost its negotiating position. The connection application should be lodged, and the approval received and checked, before the construction contract is signed. Also verify the installer's service arrangements and spare parts availability for the inverter, VSD and pump controller in your region, before signing.

The 30 kW regional feed-in tariff eligibility cliff

This is the rule most likely to surprise a Queensland farmer, and it sits at the heart of most farm solar tariff Queensland questions.

The regional feed-in rate is 6.006 cents per kilowatt-hour: the Queensland Competition Authority sets the regional feed-in tariff for eligible customers in regional Queensland, and the rate from 1 July 2026 to 30 June 2027 is 6.006 cents per kilowatt-hour, paid by Ergon Energy Retail for eligible exports. That is down from 8.660 cents per kilowatt-hour in 2025–26. At roughly six cents a unit, exported solar power is worth far less than solar power used on site, which avoids buying a unit at the farm's retail rate.

Above 30 kW of inverter capacity, regional feed-in eligibility ends: according to Cotton Australia's published guidance for farmers (page crawled November 2026), large Ergon Energy customers and those with inverter capacity above 30 kW are not eligible for the regional feed-in tariff. A farm in that position may still be permitted to export, subject to network approval, but it will not be paid for the exported energy. That is a cliff, not a taper. Ask the designer to show the inverter capacity, the feed-in eligibility position, and the modelled value of exports with and without feed-in payments, so the trade-off is visible before the decision is made.

Whether the threshold moves with the new 1 MW cap is not confirmed: the Small-scale Renewable Energy Scheme was expanded from 1 October 2026 so eligible systems up to 1 MW can earn small-scale technology certificates (STCs), where the previous cap was 100 kW. That expansion is about certificates for the system itself; it does not automatically change the regional feed-in tariff rules. Whether the 30 kW feed-in eligibility limit changes with the new 1 MW cap has not been confirmed, and this guide does not assume that it has. Confirm the position on your own connection approval and with Ergon Energy Retail before relying on any feed-in income from a system above 30 kW. Farms with questions about energy on their property can also call the Queensland Farmers' Federation Energy Information Service for Landholders (EISL), a service set up for on-farm energy questions, independent of any installer.

Dynamic and flexible export connections

Where a fixed export limit is too small for the system a farm needs, a dynamic or flexible export connection is the alternative worth understanding. It is not a way to export without limit — it is a way to export more, most of the time.

How a dynamic connection works: under a dynamic (flexible export) connection, the distributor can vary the export limit in response to network conditions. When the network has capacity, the farm can export at the higher limit; when the network is under stress, export is reduced. Ergon Energy's published guidance states a premises can still export 1.5 kW even when export must be reduced, unless a significant emergency requires stricter limits.

The size bands are set by standard: Ergon Energy's dynamic connection arrangements are set out in its network standards — systems under 30 kVA fall under standard STNW3510, and systems from 30 kVA to 1,500 kVA fall under standard STNW3511. Note that Ergon Energy and Energex specify inverter limits in kVA, not kW. Ask the designer to state inverter capacity in kVA as the distributor does — these Ergon farm solar export rules are set by the connection approval, not by any published table.

Connection type	Total inverter capacity	Export limit
Single-phase, fixed	10 kW	5 kW
Single-phase, dynamic	10 kW solar + 10 kW battery	Up to 10 kW
Three-phase, fixed	10 kW per phase (30 kW total)	5 kW per phase (15 kW total)
SWER, fixed	10 kW	2 kW
SWER, dynamic	15 kW solar + 15 kW battery	Up to 10 kW

When dynamic export is worth it: a dynamic connection is worth considering where the farm's daytime load is high but not always high enough to absorb all solar generation. It is less valuable where the farm already consumes almost everything it generates during the day. Ask the designer to model the farm's export under both arrangements and show how often the dynamic limit would actually be used.

When export income barely matters: self-consumption decides

For many Queensland farms, export income is a minor part of the return, and self-consumption is nearly the whole story. Solar power used on site avoids buying a unit of grid electricity at the farm's retail rate, while solar power exported earns the feed-in rate — about six cents a unit in regional Queensland for eligible customers in 2026–27, and nothing at all for customers above the 30 kW eligibility threshold. Ask the designer to state the modelled self-consumption rate — by month, not just annually — and to show the return with export income removed entirely. If the project only works with export income included, the farm should know that before signing.

Load shifting is the cheapest storage: shifting a load into solar hours is storage without a battery. Running the irrigation pump during the day and chilling the cold room down during solar hours are ways of storing solar energy as water in a tank or dam, or as cold in a room. Before a battery is specified, ask the designer to show what load shifting alone achieves, and what the battery adds on top of it.

Tariff choice is part of the design: a farm's retail tariff determines what each unit of solar self-consumption is worth. The Australian Energy Regulator handed down its final decision on 30 October 2026 on the Energex and Ergon Energy network tariff proposals, refusing the distributors' requests to remove optional demand tariffs — so the optional demand tariffs remain available. Whether a demand tariff suits a farm depends on its load shape. Model the tariff choice on the farm's own interval data.

Diesel displacement and off-grid or standalone bores

Not every farm pump runs on grid power. Many remote bores, stock watering points and irrigation pumps run on diesel, and for those, the comparison is not solar against grid power — it is solar against diesel. A diesel pump burns fuel every hour it runs, needs servicing, and needs fuel delivered to a remote site. Solar has a higher upfront cost and a lower running cost.

A published example from Western Australia illustrates the scale, and it should be read as a published example from another state, not as a Queensland case study: it is reported (23 June 2025) that a mixed farming and orchard irrigation operation at Charley Creek in Western Australia, Hearman Ag, was using about 8,000 litres of diesel a year — roughly $15,000 a year — to run a 115-horsepower stationary engine for irrigation, and received a $138,000 grant from the Coles Nurture Fund toward a solar pumping project costing about $200,000, pumping water to a 2 million litre dam 30 metres above the orchard. That is a Western Australian example, and it should not be quoted as a Queensland payback. Its value is as a scale check: the numbers deserve a proper feasibility assessment, not a rule of thumb.

Off-grid solar pumping for remote bores: for a bore beyond the grid, or where a grid connection would cost more than the solar system, a standalone solar pumping system — panels, a pump controller and a pump, with water storage instead of a battery — is often the most economical option. Water is pumped into a tank or dam while the sun shines, and gravity does the rest. Ask the designer to state the storage volume, the days of autonomy it provides, and the backup arrangement, in writing.

Battery storage versus water storage

When a farm asks whether it needs a battery, the answer is often that it needs water storage instead — or as well. The two store different things, and confusing them is an expensive mistake. Pumping water uphill into a dam or tank while the sun shines stores solar energy as gravitational potential energy. Where the farm's geography allows it, water storage is usually the first storage option to consider, and a battery the second. The published Western Australian example above shows a 2 million litre dam 30 metres above an orchard.

A battery stores electricity; a tank stores water: the distinction matters because the farm's need is usually water at a particular time, not electricity at a particular time. If the water can be pumped during the day and used later, the tank is the battery. A battery is needed only where the electricity itself must be used later — for evening shed loads, cold rooms, dairy milking, or a pump that must run after dark because the water order or the licence requires it. Ask the designer to state which need the battery serves.

Batteries have their own economics and their own rules: the federal Cheaper Home Batteries Program has been in place from 1 July 2025, and from 1 January 2027 the STC deeming period for small-scale solar drops from five years to four years, and the battery STC factor drops from 6.8 to 5.7, according to published guide figures. Any proposal quoting a battery value should state which settings it relies on. The battery program is aimed at household batteries — confirm eligibility for the farm's specific system with the Clean Energy Regulator's published guidance and on the quote itself. Batteries also need siting with fire separation, ventilation, access for emergency services and the applicable standards in mind. Verify the battery location, fire separation, signage and emergency procedures are covered in the design, and the warranty terms against the proposed cycling pattern.

The SRES 1 MW expansion: what changed on 1 October 2026

The small-scale scheme now reaches 1 MW: from 1 October 2026, the federal Small-scale Renewable Energy Scheme (SRES) is expected to be available for solar systems up to 1 MW, where the previous limit was 100 kW. That matters for farms, because many farm systems sit in the 100 kW to 1 MW band. Cotton Australia's published guidance for farmers (page crawled November 2026) lists those farm applications explicitly.

Applications are not yet open: as at 13 November 2026, Clean Energy Regulator STC applications for the mid-scale band — systems from 100 kW to 1 MW — were still not open, and are expected to open in mid-to-late November 2026. A farm signing a contract now should not assume the STC value is locked in. Ask the tenderer how the STC value in the quote is calculated and who carries the risk if the certificates cannot be claimed as assumed. Verify the position on the quote and with the Clean Energy Regulator's current guidance. The scheme provides a fixed five-year deeming period for eligible mid-scale systems.

The headline saving is a government estimate, not a fixed rebate: the government has published a headline estimate of around 20 per cent off the upfront cost of a medium commercial system under the expanded scheme. That is a government estimate, not a guaranteed discount on any particular farm system. Ask the tenderer to show the STC value as a separate, itemised figure with the STC price and deeming assumption stated.

The 1 January 2027 step-down still applies: from 1 January 2027, the STC deeming period for small-scale solar drops from five years to four years, and the battery STC factor drops from 6.8 to 5.7, according to published guide figures. The certificate value available for a given system is therefore scheduled to fall at the start of 2027. That is a timing factor, not a reason to rush a poor design. Any proposal quoting an STC value should state which deeming period it relies on and what the value would be under the 1 January 2027 figures.

What a farm solar quote must show

A farm solar quote is a construction proposal, not a product purchase. The checks below are the minimum a farmer should apply before signing.

Interval data and pump duty: the quote must state the interval meter data it is based on, the pump duty it assumes — which pumps, what power, how many hours, in which months — and the self-consumption it models by month and by day type. Verify the data is the farm's own.

Connection and export: the quote must state the distributor, the connection type (fixed or dynamic), the approved inverter capacity in kVA, the export limit, and any export-limiting device or dynamic control requirement. Verify those figures against the connection approval itself.

Tariff and feed-in position: the quote must state the retail tariff modelled, the feed-in rate applied, and whether the farm is eligible for the regional feed-in tariff at the proposed inverter capacity — including the 30 kW eligibility position. Verify the feed-in rate against the Queensland Competition Authority's published rate.

Pump, drive and starting: the quote must name the pump and VSD arrangement, state the starting current and how it is handled, and confirm the compatibility of the VSD, the inverter and the pump. Verify the starting-current calculation and the inverter's surge rating in writing.

Equipment and warranties: the quote must name the panel, inverter, battery (if any), VSD and pump controller make and model, with datasheets and warranty terms. Verify approvals and that warranty cycling limits match the proposed use.

STCs and timing: the quote must state the STC value separately, with the STC price, the deeming period and the scheme eligibility position stated, and must say who carries the risk if the mid-scale application window or eligibility rules change. Verify the position with the Clean Energy Regulator's current guidance.

Electrical, structural and water scope: the quote must include the switchboard assessment and any upgrade, cable routes and sizes (including long runs to bores), protection, metering, monitoring and structural assessment, plus the water-side scope — pipes, tanks, dams and pump installation — or state plainly what is excluded.

Performance and commercial terms: the quote must state the expected annual generation and self-consumption and how performance is measured. The payment schedule should be tied to verifiable milestones, with a defects liability period and a maintenance offer.

How This Works for Both Sides

A good farm solar project works for the farmer and for the contractor — and a proposal that only works for one side is a warning sign.

For the farmer: the value is lower grid energy use during the day, lower diesel use where solar displaces it, and a clearer picture of energy and pumping costs through proper metering and monitoring. The farmer's side of the bargain is to provide good data, make timely decisions on tariff and connection, and maintain the system as specified.

For the contractor: the value is a well-defined scope, a client that has provided interval data and a clear brief, and a project that can be delivered without variations caused by missing information. A contractor designing from real pumping data, with a proper connection approval, can price the job properly and stand behind it.

For both sides: the shared interest is a design independently checked before construction, a contract with clear milestones and a measurable performance expectation, and monitoring both sides can see. If a tenderer resists an independent review, ask why — a sound design has nothing to lose from a second pair of eyes.

Frequently asked questions

How big a solar system does my Queensland farm need?

There is no standard size. It depends on the pump's power and duty, the months the pumps run, and the export limit on the connection. The right size comes from interval meter data and the pumping schedule, modelled month by month.

Can solar run my irrigation pump?

Yes, where the pump runs during the day — solar generation and irrigation pumping naturally line up. The design must handle the pump's starting current, usually with a variable-speed drive.

What is the export limit on a SWER line?

Under the published Queensland grid connection rules current as of September 2026, a fixed SWER connection allows 10 kW of total inverter capacity with 2 kW of export. A dynamic SWER connection allows 15 kW of solar plus 15 kW of battery, with export of up to 10 kW.

Will I be paid for the power my farm exports?

In regional Queensland, the Queensland Competition Authority rate from 1 July 2026 to 30 June 2027 is 6.006 cents per kilowatt-hour for eligible exports, paid by Ergon Energy Retail. But large Ergon Energy customers and those with inverter capacity above 30 kW are not eligible for the regional feed-in tariff, and will not be paid for exported energy. Whether that 30 kW limit changes with the new 1 MW scheme cap has not been confirmed.

What is the SRES 1 MW expansion, and does it apply to my farm?

From 1 October 2026, the federal Small-scale Renewable Energy Scheme is expected to be available for solar systems up to 1 MW (was 100 kW). But Clean Energy Regulator STC applications for the mid-scale band were still not open as at 13 November 2026, and are expected to open in mid-to-late November 2026.

Do I need a battery, or is water storage better?

It depends on what must be used later. If water can be pumped during the day and used later, a tank or dam is usually the cheaper storage — it stores water, and gravity does the rest. A battery is needed where electricity itself must be used later.

Can solar replace diesel for a remote bore?

Often, yes — a standalone solar pumping system with water storage can replace or substantially reduce diesel use for a remote bore, and it removes the need for fuel delivery to the site. The design must state the storage volume and the backup arrangement. Treat the published Western Australian example as a scale check from another state, not a Queensland payback.

Should I install before 1 January 2027 to beat the STC step-down?

From 1 January 2027, the STC deeming period for small-scale solar drops from five years to four years and the battery STC factor drops from 6.8 to 5.7, according to published guide figures. That is a timing factor, not a reason to rush a poor design.

Get an independent check before you sign

Solar for a Queensland farm can be a strong investment — but only if the design matches the farm's real pumping schedule, the tariff and export rules are modelled honestly, and the quote is read as a construction contract.

EServices4U provides independent solar and electrical engineering advice for Queensland and Australian farms, businesses and homeowners. We do not sell solar installations and we do not receive installer commissions, so our reviews are independent of any tenderer.

• Start with a free 15-minute consultation to talk through your tender, system, building, or project and find out which fixed-fee review fits, if any. Call/WhatsApp 0480 001 498 or email growthpartner@eservices4u.com.au. No obligation, and it does not include a written report.

• Residential quote review — from $149: a fixed-fee independent review of a residential solar or battery quote, for farmers who want the same rigour applied to a home or homestead system. See packages and pricing.

• Solar & battery feasibility — from $299: an independent assessment of whether solar and batteries suit your farm, including pump duty, tariff, export and storage considerations, before you go to tender.

• Home Owner's Engineer — from $599: independent engineering support for a residential project, from design review through to installation checks. See Owner's Engineer services.

• Commercial Infrastructure Assessment / RPEQ & RPEV SLD Sign-Off — from $495: an independent commercial assessment, including single-line diagram review and sign-off where applicable, for farm, commercial and industrial projects. See packages and pricing and meet the team.

To start, visit the EServices4U home page or request a quote review, or call/WhatsApp 0480 001 498 or email growthpartner@eservices4u.com.au. Bring your interval data, your connection approval and your tender — an independent check before signing is the cheapest insurance a farm can buy.