Energy Savers
Border Rivers

Inglewood Horticulture Farm

Implemented
123
Energy Savings
29.8
Savings
4,556
Industry
Horticulture
Product
Olives and olive oil
Irrigation
Drip
Pumps
Centrifugal
Technology
Solar Pumping
Capital Cost
10,336

Summary

A horticulture farm located in Inglewood has achieved 123% energy savings with associated cost and emission reductions from a solar pumping solution implemented based on the recommendations of a recent energy savers audit.

The farm, near Inglewood, has 8,000 trees and produces table olives and olive oil. It is irrigated year-round depending on rainfall. Water is supplied from access to the nearby Inglewood Dam. The dam pump has a current energy benchmark of 277kWh/ML.

It is a small site consuming approximately 30,000kWh at a cost of $11,000. The business has already invested in a 10kW solar systemThey recently produced over 30 tonnes of product but expect smaller harvests in the coming years due to the ongoing effects of the drought. 

The infrastructure contributing to the energy consumption onsite consists of:

  • A large packing shed with grading, storage, and pressing machine including a 10kW solar system 
  • A 22kW centrifugal dam pump 

A recent energy audit showed how improving the current systems can lead to energy and cost savings. The energy audit recommended the following changes to improve efficiency and reduce costs:

  • Replace the dam pump to improve the efficiency of the irrigation system.
  • Installation of a ground-mounted 16.5kW solar system at the dam pump.

Table 1. Energy and cost savings from audit recommendations

Recommendations Annual Energy Savings (kWh) Annual Cost Savings ($) Emission Savings (tCO2-e)  Capital Cost ($) Payback Period (years)
Pump replacement 8,700 3,600 7 41,000 11.4
16.5kW solar system  24,000 9,900 19.3 25,000 2.5
Total 32,700 13,500 26.3 66,000 7

 

The grower proceeded with the installation of a 25.74kW Ground-Mounted Grid-Connected Solar system at the pump site. The pump was not upgraded as it was relatively new and the payback was considered too long. The savings made have been measured in a Measurement and Verification (M&V) process, as outlined in Table 2.

Table 2. Estimated and Actual energy and cost savings from the 25.74kW Solar PV.

Metric Audit estimation M&V calculation Variation (%)
Energy Savings (kWh) including exports 24,000 36,753 53
Cost Savings ($) including exports revenue 9,900 4,556 -54

 

The greater energy savings measured compared to those estimated from the audit recommendation have been influenced by the installation of a larger solar system. The lower cost savings have been influenced by the high amount of electricity fed to the grid and the lower feed-in tariff offered in 2020 compared to the evaluated in 2019.

From the solar energy generated, 12,936 kWh are being used onsite valued at $3,128 and 23,817 kWh are being exported to the grid with a revenue of $1,429, and around 17,064 kWh valued at $4,126 are being sourced from the grid. However, if the farm was able to adjust pump energy usage during the daytime to offset all the energy consumption from the grid, it would lead to further cost savings as the revenue from feeding into the grid is lower than the cost of using energy from the grid.

By installing the recommendation in the audit, the business has reduced energy consumption by 123% and costs by 41%, with carbon emission savings of 29.8 tCO2-e per year.

Table 3. Pre and post implementation energy consumption, costs, and energy productivity improvements

Metric  Pre- implementation  Post-  implementation  Reduction (%) 
Energy Consumption (kWh)  30,000 -6,753 123
Cost ($)  11,000 6,444 41
Energy Productivity (kWh/tonne) 909 -205 123


An energy audit is a good investment
 

An energy audit is a great first step in moving a business towards a more efficient future by reducing energy use, costs and carbon emissions onsite.  

An energy auditor will review your past energy bills, your equipment and the way your business operates. They’ll show you where you’re using excess energy and explain what you can do about it. Find out about what’s involved in an energy audit HERE. 

See our range of agricultural energy efficiency case studies 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.  

The Energy Savers Plus Extension Program is delivered by the Queensland Farmers Federation with support and funding from the Queensland Department of Energy and Public Works. 

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