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Technical requirements, assessment, fees and schedules

All applications require our assessment to ensure they meet our technical requirements. Please ensure you complete and attach the relevant schedules to your application.

Generation management applications with energy smoothing will undergo a Network Impact Assessment. Applications that also require feed-in management or zero export will need a System Impact Study and a fee applies. Horizon Power cannot confirm these costs until after the study is completed. 

Please be mindful that even when you feel you have complied with all the technical requirements, there is no guarantee that your application will be approved. For example, an application may not be accepted due to local network constraints, something you have no control over.

You cannot proceed with any installation until the customer has received approval from Horizon Power in writing.

The renewable energy Technical Requirements specify the minimum technical requirements for customers or companies connecting renewable energy to our low voltage network. 

Please note: 

  • Included in the technical requirements are specifications for generation managed renewable energy installations. In these installations, the electricity output is controlled or managed to help maintain the reliability of power supply to all our customers. Visit the Generation Management page.
  • The quick reference table provides an overview of the generation management requirements for each class of installation. Please refer to the Technical Requirements for Renewable Energy Systems Connected to the Low Voltage (LV) Network via Inverters full details. The customer's electrical installation needs to be designed according to specific system and circuit diagrams to ensure a compliant connection, as per the table.
  • Some specific applications may also require zero export or feed in management as part of the Horizon Power technical assessment process.
  • Class 1 system size: Up to and including 5kW
  • Class 2 system size: Over 5kW but less than or equal to 50kW
  • Class 3 system size: Over 50kW but less than or equal to 1MW
   
Type of application Technical assessment Fees
Class 1 applications with no generation management

Application with four schedules

These applications require the following schedules to be complete and attached to the application: 
•    Schedule 1 – Customer Compliance Checklist 
•    Schedule 2 – System Diagram 
•    Schedule 3 – Circuit Diagram 
•    Schedule 4 – Cable Data

There is no Horizon Power fee for this assessment.
All class 1 and 2 applications with generation management (energy smoothing)

Application with five schedules

All applications require the following schedules to be complete and attached to the application:

  • Schedule 1 – Customer Compliance Checklist
  • Schedule 2 – System Diagram
  • Schedule 3 – Circuit Diagram
  • Schedule 4 – Cable Data
  • Schedule 5 – National Professional Engineers Register (NPER) sign-off letter

Engineering assessment
Your technical design will be assessed for its impact on the local network. Our engineers may be in contact if additional information is required.

Your NPER Chartered Professional Engineer may charge you a fee for the review of your application and the sign-off letter.

There is no Horizon Power fee for this assessment.

Class 3 (in some cases applies to Class 2) system size application with energy smoothing and feed-in management

System impact study

All applications require the following schedules to be complete and attached to the application:

  • Schedule 1 – Customer Compliance Checklist
  • Schedule 2 – System Diagram
  • Schedule 3 – Circuit Diagram

Schedules 4 and 5 will be requested later in the process

Your technical design will be assessed for its impact on the local network, as well as the wider electricity system. This is more in-depth study and a fee applies.

The high level process to connect consists of:

  1. Application
  2. Preliminary Quote
  3. Formal Quote
  4. Construct and Commission

A feasibility study fee of $3,500 will apply and you will be advised of any additional charges, which will be dependent on the size and complexity of your proposal, at this stage.

We will send you a quote for the assessment fee before commencing the study.

Please complete and attach the relevant schedules to you application, as required for your system size.

   

Schedule 1

Customer Compliance Checklist

This is a checklist comprising the key elements that need to be satisfied in order to comply.

PDF checklist

Complete the checklist and enter any relevant comments. The checklist must be attached to all applications.

Schedule 2

System Diagram

This is a conceptual diagram that illustrates the functional relationships between key subsystems using solid lines. The Customer’s System Diagram shall be in accordance with section 5.1 of the Technical Requirements.

View a sample of a system diagram

A system diagram must be attached to all applications

Schedule 3

Circuit Diagram

This includes one or more diagrams detailing the electrical connections from the point of connection through to the renewable energy source. The Customer’s Circuit Diagram shall be in accordance with section 5.2 and the other requirements of the Technical Requirements.

View a sample of a circuit diagram

A circuit diagram must be attached to all applications

Schedule 4

Cable Data

This is the data associated with power cables connecting the Customer’s grid connected inverter to Horizon Power’s electricity distribution system. This includes the consumer mains cable. View a sample of a cable data

Cable data must be attached to all applications, except for Class 3 system size which will be requested it at a later stage

Schedule 5

National Professional Engineers Register (NPER) sign-off letter

For Class 1 and 2 installations that require Generation Management, a NPER accredited engineer shall validate that the design is in accordance with the Technical Requirements. An installer may reuse a NPER declaration for multiple installations providing the installations do not differ with the NPER validated reference design in certain elements.

For every Class 3 installation, a NPER accredited engineer shall validate that the design is in accordance with the Technical Requirements and provide supporting documentation. NPER accreditation for Class 3 installations cannot be reused.

The Australian National Engineering Registration Board provides a National Professional Engineers Register (NPER) of Chartered Professional Engineers.
  • Select 'Start Application'
  • Area of Practice: select 'Electrical'
  • As a minimum, enter 'WA' for State and 'Australia' for Country.
To avoid any conflict of interest, Chartered Professional Engineers in the employ of Horizon Power are unable to provide NPER sign-off letters.
View a sample of a NPER sign-off letter

A new version of Australian Standard AS /NZS  4777.2:2015 is effective from October 2016 which applies to inverters for renewable energy systems.

Only inverters that comply with  AS/NZS 4777.2:2015 can be supplied, installed and connected to the Horizon Power network.

The inverter standard applies to inverters for renewable energy and battery energy storage systems that are connected to the network operated by Horizon Power.

Solar energy system suppliers, inverter suppliers and electrical contractors must ensure they are aware of these changes to the inverter standards, as well as the updated technical requirements.

You can access the new documents here:

You can download a copy of AS /NZS 4777.2.2015 via standards.org.au

For more information, please call the Horizon Power Renewable Energy Information Line on 1800 618 916.

Frequently asked questions

The customer’s bill will list this information.  

Please note: if your intent is to supply the renewable energy generated back to Horizon Power as a power producer, then your 'tariff' is IPP (Independent Power Producer). Horizon Power is unable to offer a renewable energy contract to M2 customers with high voltage supply connections.

  • Class 1 system size: Up to and including 5kW
  • Class 2 system size: Over 5kW but less than or equal to 50kW
  • Class 3 system size: Over 50kW but less than or equal to 1MW
  • Eligibility for Class 3 system sizes (50-1000 kW) will also depend on how you intend to use the renewable energy you generate.
Prosumers If your intent is to connect a renewable energy system to a Horizon Power network to partially generate your own electricity and potentially export excess electricity to the Horizon Power network, then you are a Prosumer.

Prosumers are offered the Renewable Energy Buyback contract or the Renewable Energy Commercial Buyback contract.
Class 3 systems sizes (50-1000kW) eligibility rule is:

Total estimated annual renewable energy generation (kWh) should be no more than 20 per cent above the customers’ total annual consumption (kWh) prior to installing the renewable energy generation.
Independent Power Producer If your intent is to supply the renewable energy generated back to Horizon Power as a power producer, then you are an Independent Power Producer (IPP).

A Power Purchase Agreement is negotiated with each IPP.
If you don't meet the Prosumer rule above, you are deemed to be an Independent Power Producer (IPP).

 

1. Ambiguity in the information supplied on the application form, in particular Schedule 4:

  • Conductor size (2.5 mm², 4 mm², 6 mm², 10 mm², etc)
  • Conductor length (m)
  • Number of conductor cores
  • Inverter configuration not identified
  • Conflicting identification of meter number and address (residential and lot number)

2. Inverter not on the approved list

3. The voltage rise is too high

4. Local distribution transformer limits have been exceeded

5. There is a phase imbalance (greater than 2.5 kVA)

6. Horizon Power system renewable energy limits reached (this is beyond your control) 

Questions?

Call our Renewable Energy hotline on 1800 618 916.