Community Batteries

Community-scale batteries are energy storage systems connected at the distribution level which allow, among other things, households that generate their own solar power to store their excess electricity in shared storage for later use. These energy storage systems typically have power capacities of 100kW up to 5MW¹ and are used to provide energy storage solutions that deliver benefits to customers, networks and the market more broadly. 

There are several types of community-scale battery installations. In the National Electricity Market (NEM), the most common form is the  ‘in-front-of-the-meter’ system where the battery is connected to the grid through its own connection point. There are also 'behind-the-meter' systems which are connected behind a customer’s existing connection point and are generally co-located with load and other consumer energy resources (CER). This case study considers grid connected in-front-of-the-meter community-scale battery systems. The case study on virtual power plants (VPPs) considers aggregated behind-the-meter batteries.

Community-scale batteries may be owned by the local distributor or a third party, including a local council, community group, retailer or other third party.  They could be operated as virtual storage for a community, or for-profit to benefit either a community (if profits flow back to the community) or the battery owner/operator.

Given that community-scale batteries are assets connected to the interconnected national electricity system, they fall under the regulatory frameworks governing the National Electricity Market (NEM) – that is, the National Electricity Law (NEL) and National Electricity Rules (NER), and the National Energy Retail Law (NERL) and National Energy Retail Rules (NERR). They are also regulated by jurisdictional energy laws in some states and territories.

Businesses that own, operate or control community batteries and/or who are responsible for the energy services provided by a community battery, will need to have regard to the national energy laws, when entering the market.  This includes requirements related to registration and participation in the wholesale and retail markets, network connections and planning, economic regulation of networks, metering arrangements and system security obligations. They may also be required to comply with Australian Energy Market Operator (AEMO) registration requirements and procedures and Australian Energy Regulator (AER) authorisation or exemption requirements. These parties may also be required to comply with various jurisdictional energy rules and regulations, including licensing schemes, depending on the state or territory in which the battery is located, the technical characteristics and the business model. 

The Use Cases on this website (‘Material’), are made available for use on the following basis:

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The community battery would be owned by the Proponent.  However, recognising that it does not have the expertise necessary to manage the storage asset, the Proponent would contract with a local renewable energy provider to operate and control the asset. 

The local energy provider is already an authorised retailer and has an established partnership with an innovative IT provider with the capability to develop the energy sharing and trading platform.

Partnering with an authorised retailer avoids the Proponent needing to obtain all the authorisations and registrations that it would otherwise need to obtain to offer services using the battery, including an energy retailer authorisation from the Australian Energy Regulator (AER) and registrations from the Australian Energy Market Operator (AEMO) as an Integrated Resource Provider. The authorised retailer can be responsible for those authorisations and registrations, complying with the related regulatory obligations including consumer protections, and billing customers. It will also have the necessary information and communication technology infrastructure already in place.  

Customers wishing to utilise the community battery to store and/or consume locally generated electricity would need to become a customer of the partnered authorised retailer for all the electricity supply at their premises.

There are a several services that would be provided by the community battery:

• services provided to the customer:
  • virtual storage service (use of the battery to store locally generated electricity for later use by the community)
  • virtual sharing service (peer-to-peer trading of locally generated electricity within the community)
• services provided to the network:
  • network support service (for example, peak demand reduction, minimum demand smoothing and voltage management)
• services provided to the market:
  • market generation service (export of locally generated electricity for sale in the wholesale market)
  • market ancillary services (export or import of locally generated electricity for sale in ancillary services markets, for example, frequency control services)

To coordinate the provision of the various services, the Proponent would outsource the provision of these services to the local energy provider (in addition to battery operation). The local energy provider could then choose to provide the services itself, or to enter contracts with other parties for the provision of these services, where it is efficient to do so.

The Proponent or local energy provider would need to negotiate a contract with the local distributor for the provision of network support services from the battery if it wished to be remunerated for providing such services.

For the purposes of this case study, the local energy provider is already an authorised retailer under the National Energy Retail Law (NERL).  Provision of the retail service by the local energy provider will avoid the need for the Proponent to seek retail authorisation from the Australian Energy Regulator (AER) itself and to establish all the necessary systems (including billing systems) to support that function. The local energy provider, as the authorised retailer, must comply with the relevant provisions of the NERL, National Electricity Rules, and AER Retailer Authorisation Guidelines. Under these instruments, it has obligations in relation to the supply of energy to customers, in particular where they supply energy to small customers. These obligations include requirements related to customer connections, consumer protections (including billing, payments, pricing, customer complaints and dispute resolution) and the terms of retail contracts with customers.

The community battery is less than 5MW and therefore exempt from requirement to register with Australian Energy Market Operator (AEMO) as an Integrated Resource Provider.  However, to be able to participate in the wholesale electricity market and ancillary service markets, the following would need to occur:

• To participate in the wholesale electricity market, a party responsible for the battery will need to be, or will need to register as, an Integrated Resource Provider. The Integrated Resource Provider will need to classify the connection point for the battery as a market connection point. This classification means the Integrated Resource Provider will be taken to be a Small Resource Aggregator, enabling the battery to participate in the wholesale market. 
• To participate in the ancillary services markets, a party responsible for the battery will need to be, or will need to register as, a Market Participant (for example, an Integrated Resource Provider or a Market Customer). The Market Participant will need to classify the battery as an ancillary service unit. This classification means the Market Participant will be taken to be an Ancillary Services Provider, enabling the battery to participate in ancillary services markets.

Importantly, only one entity can be the financially responsible market participant for a connection point. For the purposes of this case study:

• the local energy provider, as an authorised retailer, would already be registered as a Market Customer with AEMO, and so will be able to provide ancillary services to the market by classifying the battery as an ancillary services unit, however
• the local energy provider would also need to register as an Integrated Resource Provider and classify the connection point for the battery as a market connection point so that it is able to participate in the wholesale market in the capacity of a Small Resource Aggregator.

The Proponent will need to pay a fee to AEMO to register as an Integrated Resource Provider if it is not already registered as such, and to classify the connection point and battery as a market connection point and ancillary service unit (respectively).³ The processes and requirements for registration is set out on AEMO’s website.⁴

There are no applicable licensing requirements in New South Wales.

To provide market ancillary services, the community battery would need to meet Australian Energy Market Operator’s (AEMO) requirements for the Market Ancillary Service Specification (MASS) and participate in central dispatch, which would require telemetry and sophisticated equipment for the battery. This is required by Chapter 3 of the National Electricity Rules (NER) and is subject to civil penalty provisions.

Connection of a community battery to a local distribution network will require a connection agreement between the battery owner/operator and the local distribution business. These agreements set out the obligations of the distribution business in respect of the provision of customer connection services to the connection point. They also set out various obligations on the customer (in this case, the battery owner/operator) including in relation to information provision and safety. 

The Electricity (Consumer Safety) Act 2004 (NSW) sets out a detailed safety regime for electrical articles and electrical installations, including approval procedures and quality standards. The Service and Installation Rules⁵ for New South Wales are also relevant to the connection of batteries to the system. 

The price the community battery pays the local distributor can affect both its profitability and how it is used at different times. Recent and proposed changes to the National Electricity Rules ⁷ for integrating storage and consumer energy resources (CER) into the National Electricity Market (NEM) mean the local distributor can in the future charge both transmission and distribution network use of system costs for a participant's gross consumed and sent out energy over relevant intervals. This means both the community battery and its customers may need to pay network costs as energy leaves a customer, enters the battery, exits the battery and arrives back at a customer. The distributor’s tariff structures and levels, including the time of day and form of its charges (that is, energy kWh or maximum import or export demand) may need to be considered in the Proponent’s commercial analysis (e.g. customer pricing, customer demand and battery asset payback period). There is no regulatory mechanism for exemption from network tariffs. In limited circumstances the local distributor is:

1. permitted to develop a bespoke tariff offering or ‘individually calculated tariff’ but this would still require Australian Energy Regulator (AER) approval in its annual tariff proposal
2. able to implement trial tariffs (which some distributors are presently exploring for community batteries), however these are likely to have a maximum period of up to 5 years before the distributor would need to seek AER approval.

As noted above, there is no regulation compelling the local distributor to procure network support services from community batteries. Whether a distributor is willing to enter such a contract and the amount it is willing to pay for services will depend on a range of factors including whether the local distribution network is facing capacity constraints at times of peak demand and/or voltage issues at times of peak export from solar systems. The local distributor may be required to calculate and pay avoided transmission use for system payments to the battery where its exports lessen peak demand at the nearest transmission network connection point. These income driving factors may change over time and may need to be considered in the Proponent’s commercial analysis.

Community batteries will require a suite of technological capabilities, irrespective of the business model employed. These are likely to include advanced metering, integration, telemetry, and control capabilities. These sophisticated technological capabilities will need to be carefully coordinated by the community battery operator to ensure the provision of services is balanced between stakeholders, while enabling the market and non-market services to be sufficiently monetised to ensure financial viability of the battery.

If the Proponent is not already a retailer, participation in markets requires registration with the Australian Energy Market Operator (AEMO). Alternatively, it requires the Proponent to establish multiple service contracts with other parties already registered with AEMO in the relevant registration categories.  

¹Final report for the ARENA-funded Community Models for Deploying and Operating DER project, carried out by the Battery Storage and Grid Integration Program, December 2020, p. 11.