General Topics
A service in the electricity system is a defined, measurable output that keeps the grid running reliably: frequency regulation, voltage control, congestion management, balancing, or the supply of electricity itself. Smart grid transitions reshape which services the system needs, who can provide them, and how they are specified, procured, and compensated — because the concept of service separates function from asset and opens provision to resources that traditional system design never anticipated.
Services are the functional building blocks of electricity system operation. Frequency regulation keeps the system stable in real time. Voltage control maintains power quality across the network. Congestion management prevents overloading of lines and transformers. Each of these functions depends on specific technical capabilities, specific institutional arrangements for procurement and verification, and specific actors with mandates, obligations, or commercial interests.
A battery, a gas turbine, a controllable load, and an aggregation of rooftop solar systems can all provide frequency response. Defining services rather than mandating specific technologies opens participation and avoids locking in particular solutions.
As distributed generation, storage, and responsive demand grow, new services become necessary at the distribution level: local congestion relief, dynamic voltage support, coordination of bidirectional power flows. Digitalisation and aggregation enable smaller resources to offer services that were previously the domain of large centralised plants. How these services are defined, standardised, and compensated determines who can participate and whether the potential of distributed resources reaches the system.1)
A service in the context of smart grid transitions is a defined, measurable output that supports the reliable and efficient operation of the electricity system. Services can be categorised by function, by the system level at which they operate, and by the entity that procures or benefits from them.2)
| Service category | Function | Typical providers |
|---|---|---|
| System balancing | Maintaining real-time equilibrium between generation and demand, including frequency response and operating reserves | Dispatchable generators, battery storage, demand response aggregators |
| Voltage and reactive power | Keeping voltage within acceptable limits across the network | Generators with reactive power capability, smart inverters, capacitor banks |
| Congestion management | Relieving network bottlenecks without requiring physical reinforcement | Redispatch of generation, curtailment, storage dispatch, demand shifting |
| Network support | Enhancing grid reliability and hosting capacity at the distribution level | Distributed energy resources, community batteries, active demand management |
| Energy supply | Delivery of electricity from producer to consumer through bilateral contracts or market arrangements | Generators, retailers, aggregators, prosumers |
These categories overlap in practice. A battery providing frequency response simultaneously stores energy for later dispatch. A prosumer feeding solar into the grid supplies energy and, depending on inverter settings, may also provide voltage support. Multi-service provision is becoming more common as digital infrastructure for verifying contributions becomes more capable.3)
Each perspective reveals a different dimension of how services work. Actors shape who provides and procures services. Technologies determine what capabilities are available and how performance is verified. Institutions define what counts as a service and how it is traded.
Service provision in traditional power systems was concentrated among a small number of large generators and vertically integrated utilities. Smart grid transitions diversify this landscape. Aggregators bundle the flexibility of hundreds or thousands of small resources into service portfolios that system operators can procure. Distribution system operators become active service buyers, purchasing local congestion relief and voltage support from connected resources. End users with solar panels, batteries, and electric vehicles begin offering services the system was never designed to receive from them.
Netherlands – GOPACS platform
A joint initiative of all Dutch grid operators enabling market-based congestion management. Generators, storage operators, and large consumers offer redispatch services through a shared platform coordinating between the TSO and DSOs.4)
Rwanda – off-grid energy service companies
Service providers deliver electricity as a bundled product in areas without grid connection, combining solar home systems with mobile payment and remote monitoring — redefining what an energy service means outside the grid paradigm.5)
Canada – Ontario IESO ancillary services market
The independent electricity system operator procures regulation, reactive support, and operating reserve services through competitive processes open to various resource types including demand response.6)
Each service has technical prerequisites: response time, ramp rate, duration, measurement accuracy, and communication latency. Fast frequency response requires sub-second activation. Congestion management requires locational awareness and coordination with network topology. Smart inverters on distributed solar systems can provide voltage regulation as an embedded function if they are configured to do so. The communication, metering, and control infrastructure that enables service verification and settlement is as essential as the energy technology delivering the service itself.
South Korea – Jeju Island smart grid test bed
Electric vehicles, battery storage, and wind turbines provide multiple grid services including frequency regulation and peak shaving, supported by advanced energy management and communication systems.
Germany – Redispatch 2.0
Updated technical requirements mandate that distributed generation above a low threshold participates in congestion management, requiring digital interfaces and communication standards connecting small plants to the system operator's dispatch process.
Brazil – ANEEL distributed generation standards
Revised grid connection standards require new solar installations to include smart inverter functions for voltage ride-through and reactive power support, embedding service provision into the connection process.
Defining a service precisely enough to trade, verify, and settle it requires substantial institutional work. Grid codes and connection standards specify the technical parameters. Market rules determine whether a service is procured competitively, through bilateral contracts, or through regulated obligations. Standardisation of service products across jurisdictions enables cross-border participation and reduces transaction costs.
European Union – ENTSO-E standard products for balancing
Harmonised definitions of frequency restoration reserve and replacement reserve products enable cross-border exchange of balancing services across European system operators.7)
India – Central Electricity Regulatory Commission
The CERC Ancillary Services Regulations 2022 established mechanisms for procuring primary, secondary, and tertiary reserve services with specific performance metrics and both administered and market-based compensation.8)
New Zealand – Electricity Authority ancillary service review
Periodic reviews assess whether service definitions and procurement mechanisms remain fit as the generation mix shifts from thermal to renewable-dominated supply.
| Term | Definition |
|---|---|
| Ancillary service | A service procured by the system operator to maintain system stability and quality of supply, distinct from energy and capacity as traded commodities.9) |
| Balancing service | A service that maintains real-time equilibrium between generation and demand within a balancing area, including frequency containment, frequency restoration, and replacement reserves.10) |
| Flexibility service | The provision of adjustable generation, consumption, or storage capacity in response to system needs, offered as a defined product in a market or through a contract.11) |
| Service product | A standardised specification of a grid service, including activation time, duration, minimum capacity, and verification method, designed to enable transparent procurement and settlement. |
| Non-wire alternative | A service-based solution — such as demand response, storage, or distributed generation — that defers or avoids the need for physical network reinforcement.12) |
Service vs. asset
A service is a function delivered to the system; an asset is a physical device that can provide one or several services. Keeping this distinction clear prevents policy and market designs from inadvertently favouring specific technologies over the functions they provide.13)
System-level vs. distribution-level services
System-level services such as frequency response operate across the entire interconnected system. Distribution-level services such as local voltage management and congestion relief operate within a defined network area. The procurement mechanisms, technical requirements, and responsible entities differ.