AEMO · AUSTRALIAN ENERGY MARKET OPERATOR
AEMO
AEMO is the body responsible for operating the Wholesale Electricity Market in Western Australia. It also operates the National Electricity Market on the east coast, but the two markets run on separate rules and infrastructure. In the WEM, AEMO manages real-time dispatch, sets the capacity requirement each year, accredits capacity providers, and publishes the market data underlying everything from spot prices to system peak forecasts. For commercial sites participating in the WEM or affected by its costs, AEMO is the source of truth for how the market is operating and how it is changing. AEMO publishes consultation papers and rule-change drafts on a continuous cycle.
AES Code · ALTERNATIVE ELECTRICITY SERVICES CODE
AES Code
The Alternative Electricity Services Code is the regulatory framework introduced by Energy Policy WA to formalise services that previously operated outside Western Australia's licensed retail framework. It covers embedded networks, on-supply arrangements, and similar electricity services provided behind master meters. Under the Code, operators are required to register, comply with formal customer protection standards, provide transparent pricing, and offer regulated dispute resolution. The Code is being rolled out in stages. For strata buildings, shopping centres, mixed-use sites, and other buildings that on-sell electricity to occupants, the Code is the regulatory framework that now applies to their arrangement.
BTM · BEHIND THE METER
BTM
Behind the meter refers to the side of the electricity connection that's inside the customer's premises, between the utility meter and the loads it serves. Solar panels, batteries, EV chargers, and load-management systems installed on a commercial site are all behind-the-meter assets. The opposite is "in front of the meter," meaning the utility-scale generation and grid infrastructure that delivers electricity to the meter. Behind-the-meter optimisation is the work of making the assets on the customer side of the meter work harder against the tariff structure they sit under and the market signals coming through the meter from outside.
C&I · COMMERCIAL AND INDUSTRIAL
C&I
Commercial and industrial is the market segment covering business customers above the residential threshold, including offices, factories, warehouses, retail centres, hospitality venues, and similar. In Western Australia, C&I sites are typically distinguished from residential by consumption volume and demand profile rather than physical scale. C&I customers above 50 MWh per year are generally classified as contestable, meaning they can choose their electricity retailer rather than being assigned to Synergy as the default supplier. C&I sites are the primary audience for active energy management because their bills are large enough that the management effort pays back materially.
Capacity Credit
Capacity Credit
A Capacity Credit in the WEM is a tradeable instrument representing one megawatt of generation or demand-response capacity available to the system during peak demand periods. AEMO determines how many Capacity Credits the system needs each year, capacity providers (generators, batteries, demand-response aggregators) are accredited to supply them, and the Reserve Capacity Mechanism settles payment for them at the Reserve Capacity Price. The total cost is recovered from load customers through the Individual Reserve Capacity Requirement. For a commercial site with eligible flexible load or storage, Capacity Credits can be a revenue stream rather than only a cost.
Contestable customer
Contestable customer
A contestable customer in Western Australia is one that's permitted to choose its electricity retailer rather than being supplied by Synergy under the prescribed customer arrangement. Generally, customers consuming above 50 MWh per year at a single connection point are contestable. Multi-site businesses where any single site exceeds the threshold are typically contestable across all their sites. Contestable customers can sign supply agreements with any licensed WA retailer, which opens up commercial tariff negotiation, customised supply terms, and contract structures unavailable to prescribed customers. Most genuine commercial and industrial sites fall into the contestable category by virtue of their consumption.
DEBS · DISTRIBUTED ENERGY BUYBACK SCHEME
DEBS
The Distributed Energy Buyback Scheme is the Western Australian government's framework for paying residential and small commercial customers for solar electricity exported to the grid. DEBS replaced the previous Renewable Energy Buyback Scheme (REBS) in 2020. The scheme pays a time-of-export rate set by the government, typically higher during early evening peak and lower during midday surplus periods. DEBS applies primarily to residential and small embedded systems; larger commercial solar systems usually fall outside DEBS and operate under direct retailer arrangements or wholesale market participation. The DEBS rate structure signals the broader direction of solar export tariffs in WA.
Demand charge
Demand charge
A demand charge is a component of a commercial electricity bill calculated against the site's peak power draw during defined billing windows, measured in kilowatts or kilovolt-amperes. Unlike energy charges, which scale with total consumption, demand charges scale with how much electricity the site needed available at a single moment, even if that moment lasted only thirty minutes. On most WA commercial bills, the demand charge is the single largest line item. Western Power's network tariff structure has been progressively weighting the demand component more heavily across pricing cycles, making peak management increasingly important to total cost.
DER · DISTRIBUTED ENERGY RESOURCES
DER
Distributed Energy Resources are small-scale generation, storage, and controllable load installed at customer sites, as distinct from utility-scale generation connected to the transmission network. DER includes rooftop solar, behind-the-meter batteries, EV chargers with bidirectional capability, and demand-response-enabled loads. In Western Australia, the increasing penetration of DER is reshaping how the WEM operates and how Western Power manages the distribution network. Regulatory frameworks around DER participation, control, and orchestration are evolving, including new arrangements for distributed PV management at scale. DER orchestration is the practice of coordinating multiple distributed resources to act as a single managed system.
DPV · DISTRIBUTED PHOTOVOLTAIC
DPV
Distributed Photovoltaic refers to solar generation installed at customer sites rather than at utility scale. Residential rooftop solar, commercial rooftop solar, and solar carports are all forms of DPV. Western Australia has one of the highest rates of DPV penetration in the world, which creates technical challenges around minimum system demand on sunny days when DPV output exceeds load. Regulatory measures around DPV control and curtailment are emerging in WA to manage these system conditions, including remote control capability requirements for newer systems. For commercial DPV owners, the regulatory direction makes the case for active management increasingly compelling.
DSM · DEMAND SIDE MANAGEMENT
DSM
Demand Side Management is the practice of changing electricity consumption to reduce cost or to support grid stability, as opposed to managing supply through generation. DSM can include load shifting (moving consumption to cheaper or less-constrained time periods), load shedding (briefly reducing consumption during high-demand events), and peak demand management (smoothing the highest consumption moments to reduce demand charges). On a commercial site, DSM is one of the cheapest available levers because it works with existing assets and doesn't require new hardware on most sites. DSM also includes participation in demand response programs where they're available.
ERA · ECONOMIC REGULATION AUTHORITY
ERA
The Economic Regulation Authority is the independent regulator overseeing electricity, gas, water, and rail access in Western Australia. For commercial energy customers, the ERA's most relevant functions are approving Western Power's network access arrangement (including tariff structures and prices), licensing electricity retailers, monitoring market conduct, and conducting market reviews. ERA decisions on Western Power's pricing cycle directly determine how network charges are structured and what commercial sites pay. The ERA also publishes ongoing inquiry reports on the WEM and related market arrangements. Its work, along with AEMO's and Energy Policy WA's, shapes the regulatory environment WA commercial sites operate in.
ESS · ESSENTIAL SYSTEM SERVICES
ESS
Essential System Services are the ancillary services AEMO procures to keep the WEM operating safely, including frequency control, regulation, and contingency reserves. ESS replaced the previous Ancillary Services market in the WEM as part of the broader reform program. Eligible generators, batteries, and demand-response providers can earn revenue by providing ESS to the system. ESS is the WA equivalent of FCAS in the National Electricity Market on the east coast, though the two operate under separate rules and pricing arrangements. References to FCAS in NEM contexts do not apply directly to WA; the WA market uses ESS as its system services framework.
IRCR · INDIVIDUAL RESERVE CAPACITY REQUIREMENT
IRCR
The Individual Reserve Capacity Requirement is the methodology used to allocate the cost of the Reserve Capacity Mechanism to each load customer in the WEM. A site's IRCR is calculated against its contribution to system peak demand during the four trading intervals of highest system demand in the previous capacity year. That contribution becomes the site's share of the total RCM cost for the following year. The methodology is being reformed, with the direction toward sharper allocation against actual peak contribution. For commercial sites, the IRCR is a meaningful line on the bill and one of the lines most directly responsive to active peak management.
NMI · NATIONAL METERING IDENTIFIER
NMI
A National Metering Identifier is the unique 10- or 11-digit code that identifies each electricity connection point in Australia. Every commercial site has at least one NMI assigned by the local network operator (Western Power in the SWIS). The NMI is used to track consumption data, allocate billing, and route market transactions between retailers, the network, and AEMO. For commercial sites considering a retailer change, a new supply contract, or active management arrangements, the NMI is the identifier those processes are anchored to. Multi-site commercial businesses have an NMI for each connection point, and the meter data behind each is the basis for site-level energy analysis.
RCM · RESERVE CAPACITY MECHANISM
RCM
The Reserve Capacity Mechanism is the part of the WEM that pays generators, batteries, and demand-response providers for being available to supply or reduce load during the highest-demand periods of the year, whether they end up running or not. AEMO sets the total capacity requirement each year, and a capacity price is determined for that requirement. The total cost is recovered from load customers through the Individual Reserve Capacity Requirement (IRCR). The current RCM review is moving both the capacity requirement and the capacity price upward, which means the RCM line on a commercial bill is rising and will continue to rise.
SWIS · SOUTH WEST INTERCONNECTED SYSTEM
SWIS
The South West Interconnected System is the electricity grid covering the southern and western parts of Western Australia, including the Perth metropolitan area, Geraldton, Bunbury, Albany, and the surrounding agricultural and industrial regions. The SWIS is the geographic footprint of the WEM and is operated by Western Power as the network. The SWIS is electrically isolated from the National Electricity Market on the east coast, which is why WA has its own market rules and operating arrangements. References to "the WA grid" or "the Western Power network" generally mean the SWIS. Most commercial electricity activity in WA occurs within the SWIS.
Synergy
Synergy
Synergy is the state-owned electricity retailer in Western Australia and the default supplier for prescribed (non-contestable) customers in the SWIS. Synergy also competes for contestable commercial supply alongside private retailers. As the default supplier, Synergy supplies residential customers and small commercial sites below the 50 MWh contestable threshold. For larger commercial customers, Synergy is one option among several licensed retailers. Synergy's prescribed tariff schedule, set under the government's electricity pricing framework, sets the baseline against which contestable customers can compare offers. For active energy management, Synergy remains the customer's retailer in most cases unless a deliberate retailer change happens.
TOU · TIME OF USE
TOU
Time-of-use tariff structures price electricity differently across defined windows of the day, week, and year. Typical structures distinguish peak periods (high-demand hours, usually weekday afternoons), shoulder periods (moderate-demand hours), and off-peak periods (overnight and weekends). Time-of-use tariffs reward consumers who can shift their consumption out of peak windows and into cheaper periods. In Western Australia, time-of-use is becoming more common on commercial tariffs, with sharper spreads between peak and off-peak rates than in previous pricing cycles. Sites with any flexibility in their consumption pattern can capture material savings by managing the timing of their load relative to time-of-use windows.
WEM · WHOLESALE ELECTRICITY MARKET
WEM
The Wholesale Electricity Market is the market through which electricity is bought and sold at wholesale prices in Western Australia. The WEM covers the SWIS geographic footprint and is operated by AEMO under rules set by the Western Australian government. The WEM has two parallel components: the energy market, which sets prices for actual electricity produced, and the Reserve Capacity Mechanism, which pays for capacity to be available at peak demand. Commercial sites do not interact with the WEM directly except through their retailer or through specific market participation arrangements. The WEM's operation determines a meaningful portion of every commercial energy bill in WA.
Western Power
Western Power
Western Power is the state-owned distribution and transmission network operator covering the SWIS. Western Power owns and operates the poles, wires, transformers, and substations that deliver electricity from generators to commercial and residential sites in southern and western WA. The network charges Western Power applies to commercial sites, including the demand charge, energy charge, and capacity contribution, are some of the largest cost lines on a commercial bill. Western Power's network access arrangement, approved by the ERA on a cyclical basis, sets the structure and prices of those charges. Western Power is not the retailer; that role is held separately by Synergy and other licensed retailers.