Energy Savers
Wide Bay Burnett

Sunshine Coast Nursery

Implemented
180
Energy Savings
17.7
Savings
5,280
Industry
Nursery and Garden
Pumps
Centrifugal
Technology
Solar Photovoltaic, Heating
Capital Cost
$14,957

Farm Profile

A nursery producing succulents on the Sunshine Coast produces around 250,000 plants per annum on an 8,000 square meter site, using over 11,000 kWh during 2018 and 15,000 kWh during 2020, with the largest non-residential load being the irrigation system. Prior to the audit, the nursery had upgraded one of the three pumps which are now irrigating at between 5.8 kWh/ML/m head and 16.8 kWh/ML/m head.

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The Energy Audit initially recommended a 13KW Solar PV system to offset the costs of power from the grid and a more effective heating system for the propagation area, although it will use slightly more power.

Solution Proposed 13kW Roof Mounted Solar PV System Heating: replace heat lamps with heat mats
Energy Savings (kWh) 18,627 -32
Cost Savings ($) 4,757 -72
Emission Savings (tCO2-e)  15.1
Cost to implement ($) 20,000 957
Payback (years) 4

 

After talks with the auditor and the solar installer, the nursery instead opted for a 19.84kW solar system to maximise the available roof space. Taking advantage of Small Scale Technology Certificates (STCs) the total cost of the system was $14,000. The system is already paying dividends with the nursery manager stating that “our electricity bills have significantly reduced”.

Solar generation exceeds overall energy, so excess energy is being fed back into the grid, helping to reduce energy bills through feed-in tariffs off-setting supply charges. Furthermore, the increased generation will help to offset future improvements and provide more capacity for the business to expand production.

QFF has also installed two real-time energy monitors to assist the farm in monitoring their energy consumption and making day to day efficiencies. The monitors cover the main load, pumps, solar system and one sub-main circuit which operates various power circuits and a set of fans. For this case, the monitor will capture the data required from the solar generation and enable specific reporting on the cost savings.

Additional changes onsite to both organisational behaviour and manufacturing processes were implemented by the nursery. Some were quick and easy to achieve and others needing more planning, including:

  • Installing 15 x 150-watt energy-efficient fans to reduce fungal disease often seen in plants as a result of high humidity.
  • Match irrigation with peak solar PV output to take advantage of onsite energy generation.
  • Activating energy-saving features of office equipment and installation of timers should be considered. Office energy use can be reduced by 10-20% when energy saving modes are activated.

Based on the Measurement and Verification process, total energy savings of 180% have been achieved, including the power exported to the grid and considering the increase in energy consumption during 2020, reaching 15,000 kWh/year given the addition of ventilation fans and the expansion of the farm. Cost savings of 152% over 2020 electricity bills have been achieved, including the feed-in revenue from solar export. Net Carbon emission savings have been estimated at 17.7 tCO2-e per year.

Solution Implemented 19.84kW Roof Mounted Solar PV Heating: replace heat lamps with heat mats Ventilation Fans
Energy Savings (kWh) 26,943 -189 -5,062
Cost Savings ($) 5,280 -48 -1,471
Emission Savings (tCO2-e) 21.8 -4.1
Cost to implement ($) 14,000 957 N/A
Payback (years) 4

 

An energy audit is a good investment 

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. 

 

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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Farmer Feedback
Our electricity bills have significantly reduced.