The farm could save electricity onsite from recommendations in the audit being:
- Upgrade lighting using new LEDs
- Upgrade Ventilation fan
- Reflective roof coating
- Solar Bore pump with or without battery storage
- Various solar P.V systems up to 100kW in size
With potential energy savings of 26,280kWh and a payback of less than a year the quickest way to improve efficiency onsite would be from the installation of new LED lighting.
||Energy Saving (kWh)
||Cost Saving Tariff 62 ($)
||Cost Saving Tariff 20 ($)
||Payback Period Tariff 62 (Years)
||Payback Period Tariff 20 (Years)
|Upgrade lighting to new LEDs
|Reflective roof coating
Under current tariff 62 the cost savings of $10,990 per annum from the replacement of the lights could be utilised to install an adequate solar PV system. The audit considered a number of opportunities with relatively quick paybacks from the implementation of solar, including:
- Two smaller residential solar systems 1.5kW and 5kW
- Bore Pump: Solar only or Solar and batteries.
- Large scale solar systems of 30kW or 99.5kW
||Energy Savings (kWh)
||Cost Savings Tariff 62 ($)
||Cost Savings Tariff 20 ($)
||Payback Tariff 62 (Years)
||Payback Period Tarif 20 (Years)
|Two Residential Solar Systems
|Bore Pump: Solar only (Tariff 33)
|Bore Pump: Solar and batteries (Tariff 33)
|30kW Solar System
|99.5kW Solar System
Assuming the bore pump is on load control tariff 33 an initial solar system is recommended to cover the load with this showing a four-year payback. Should battery pricing decrease, then the secondary option may be worth considering. It would be worthwhile to factor this in when designing a system using a battery capable invertor.
Solar systems greater than 30kW are subject to a more complex network connection process, so the installation of the 30kW system would prove beneficial at this stage. With a capital cost of $41,000 the audit recommended remaining on tariff 62 as the system shows a payback of 2.9 years. Moving to tariff 20 the payback for the 30kW system would increase to 4.3 years. The farm will be required to move to Tariff 20 on 1 July 2021 when the Obsolete Tariffs cease.
||Current Usage (kWh)
||Energy Saving (kWh)
||Cost Savings ($)
||Lighting and 30kW Solar PV
|Main Bore Pump
||Solar PV only
Implementation of the recommendations at the piggery will ensure that the farm is able to remain a small electricity user and able to remain on small business tariffs.
Implementation of the above recommendations from the energy audit would significantly reduce the kWh and dollar costs per unit of output at the farm with new KPIs reduced.
||ANNUAL ENERGY Total (kWh)
||Annual Energy Cost ($)
||KPI (kWh/Weaned Pig)
||KPI ($Cost/Weaned Pig)
|Post Audit (Gas Saving)
From the table the farm could realise a 37 per cent reduction in energy consumption, and 42 per cent in energy costs per unit of output.