HQ Plantations near Gympie manages 343,000Ha of land and is the largest commercial forestry plantation in the state. Over a production area of 212,000Ha, 2.3 million m3 of wood is harvested, sequestering 1,810Mt of CO2 annually.
One of the keys to HQ Plantations production cycle is an onsite 26-hectare nursery, consisting of 7.6Ha of production area, 2.9Ha of shade structures and 4.7Ha of full sun growing area producing over 10 million seedlings annually.
A snapshot of total energy use and two main production systems contributing to energy consumption onsite includes:
| Annual Energy Use | kWh | Cost ($) | T CO2-e (Tonnes) |
| Site Total | 172,117 | 46,552 | 160.8 |
| Pumping | 71,913 | 6563.85 | 69 |
| Propagation | 48,061 | 4235.65 | 46.1 |
| Maximum Demand | 101kVA |
The energy audit identified larger energy saving measures with recommendations to:
| Solution | Reduce Time of Use of Steam Generator | Install 30kW Solar PV | Move tank filling to off-peak | Identify Peak Demand Causes | Turning Off Lights and Appliances | TOTAL |
| Energy Savings kWh | 19,602 | 44,170 | 0 | 0 | 4,207 | 67,979 |
| Demand Savings kVA | 0 | 0 | 6.4 | 11.8 | 0 | 18.2 |
| Cost Savings | $1,789 | $16,145 | $2,813 | $2,575 | $366 | $24,333 |
| Carbon Emission Reductions (t CO2-e) | 18.03 | 40.64 | 0 | 0 | 3.87 | 62.54 |
| Cost | $4,700 | $42,000 | $0 | $0 | $0 | $46,200 |
| Payback (years) | 2.6 | 2.6 | N/A | N/A | N/A | N/A |
Water is supplied to the main tank from two bores, automated to fill when the water level drops below a predetermined level. Water is then pumped to the nursery using four multi-stage variable speed pumps.
Shifting the tank-fill pumping to off-peak times has the potential to reduce demand by 6.4kVA at a cost saving of $2,813 per year. The average cost to install an energy monitoring device which can monitor up to two three phase circuits is $1000. Further demand reductions can be found onsite.
A real-time energy meter was installed onsite capturing the main pumping circuit which supplies the header tank. The device will allow the business to understand their energy consumption. Read more about HERE.
The Energy Savers Audit showed the 10,227,684 plants per annum are produced using 172,471 kWh at a cost of $16,698, excluding supply and demand charges. Should the plantation adopt all the recommended changes with the same output, the energy consumption per unit would be reduced by around 60%.
| Metric | Pre-Audit | Post Audit |
| kWh/unit | 0.016 | 0.010 |
These estimated costs and savings will be updated to actual savings once the farm has implemented the projects.
An Energy Savers field day was at HQ Plantations with presentations on water and energy efficiency, and a technology showcase highlighting efficient pumps, lightweight solar PV and new financing opportunities. Click HERE for more information.
An energy audit is a great way for a business to cut costs and boost productivity. Find out about what’s involved in an energy audit HERE and subscribe to our bi-monthly energy e-news HERE.
If you have any energy efficiency related questions for the team get in touch at energysavers@qff.org.au.