ONS

What ONS does

ONS (Operador Nacional do Sistema Elétrico) is a Brazilian non-profit civil association founded in 1998 that operates as the country's sole National Electric System Operator under regulatory oversight from ANEEL (the National Electric Energy Agency) and policy direction from the Ministry of Mines and Energy (MME). The organization coordinates and dispatches the National Interconnected System (SIN), which covers approximately 93% of Brazil's territory across four subsystems (Norte, Nordeste, Sudeste/Centro-Oeste, Sul) and interfaces with 50 transmission companies, hundreds of generation facilities, distribution utilities, large consumers including data center operators, and international interconnections with Argentina, Paraguay, Uruguay, and (planned) Bolivia. ONS conducts capacity reserve auctions, manages grid stability, tracks real-time energy balance by source (hydro, wind, solar, thermal, nuclear), and supervises reservoir storage across major basins.

ONS's core technical platform combines a real-time grid monitoring and dispatch control system with an AVEVA PI System-integrated energy management platform, exposed publicly through the Dados em Tempo Real (Real-Time Data) portal covering load, generation, energy balance, and reservoir data. In 2024 this integration delivered a reported 98% improvement in operational communication efficiency and avoided $11.4 million in losses. Recent regulatory milestones include ANEEL's authorization of the POTEE 2025 plan (R$1.05 billion across 687 reinforcement projects through 2029), ANEEL's June 2026 approval of Brazil's first energy storage regulatory framework assigning ONS dispatch authority over storage assets, and ONS's role in Brazil's first national battery energy storage auction framework with BNDES.

ONS does not sell products or services commercially. As a government-mandated system operator, it is funded by regulatory tariffs and fees collected from electricity sector participants, and operates on a non-profit basis to ensure coordination of Brazil's interconnected grid. Its strategic priorities include reducing renewable energy curtailment (3.3 million MWh curtailed in Ceará since October 2021), securing capacity adequacy through auctions (approximately 19 GW contracted in March 2025), and integrating emerging high-load segments such as data centers in the Northeast.

Name

ONS

Legal name

Operador Nacional do Sistema Elétrico

Website

https://ons.org.br

Company type

Private

Founded year

1998

Operating status

Operating

Headcount range

501–1,000 employees

Short description

ONS is Brazil's state-mandated National Electric System Operator, coordinating dispatch, transmission, and capacity auctions across the SIN interconnected grid. It serves all generators, transmission firms, distribution utilities, and large consumers under ANEEL regulation.

Ownership category

akta.pro rank

Product category

Electricity Grid Operations

NAICS

Electric Bulk Power Transmission and Control (221121), Electric Power Transmission, Control, and Distribution (22112)

SIC

Electric Services (4911)

akta.pro primary industry

Control Room HMI/Visualization, Alarm & Event Management (EUADAEAJ)

akta.pro secondary industries

Resource Adequacy, Capacity Expansion & Integrated Grid Planning (IRP linkages) (EUADAGAI), Outage Management, Fault Detection & Restoration (OMS/FLISR Edge) (EUADAPAN), SCADA/DMS/OMS Integration, Upgrades & Managed Services (EUAEANAE), Operations Control & Dispatch (Remote Operations Centers, Curtailment, Compliance) (EUAMAGAK), Electrical Systems O&M (Substations, Transformers, Switchgear, Protection & Controls) (EUAMAGAH)

Keywords

• National grid operator
• Electricity dispatch coordination
• Power system management
• Transmission planning services
• Grid stability monitoring

Headquarters

HQ city

Cidade Nova

HQ country

Brazil

HQ region

Latin America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Technology or R&D, Personnel, Operations, Infrastructure

Distribution channels1 record

Marketing channels1 record

Core offering

ONS operates and coordinates Brazil's National Interconnected System (SIN), the national electricity grid covering approximately 93% of the country's territory. Its core offering is real-time grid monitoring, generation dispatch control, and capacity auction coordination across four subsystems (North, Northeast, Southeast/Central-West, South). The organization integrates hydro, thermal, wind, solar, and nuclear generation, manages reservoir storage capacity, conducts capacity reserve auctions, and oversees transmission infrastructure planning in coordination with ANEEL, MME, and EPE.

Product overview

ONS operates a unified grid management and monitoring platform providing real-time operational data on Brazil's national electric system. The core product is the Dados em Tempo Real (Real-Time Data) portal, which aggregates and displays load and generation data, energy balance metrics, and reservoir status across all four of Brazil's electrical subsystems plus international interconnections. The platform is accessible via web-based dashboards that present live and historical operational metrics without a separate module architecture.

Differentiator

Problem solved

Functional benefit

Products and services

• Dados em Tempo Real (Real-Time Data Portal) Web-based monitoring platform providing real-time information on power grid load, generation by source (wind, hydro, thermal, nuclear, solar), energy balance across Brazil's subsystems (North, Northeast, Southeast/Central-West, South), reservoir levels, and international power exchanges with Argentina, Paraguay, and Uruguay. Targeted at electricity sector participants, regulators, and the general public.
• Reservoir Management Service Monitoring and management service for reservoir storage capacity across major basins and reservoirs in Brazilian subsystems, tracking usable volume and storage capacity in MW-months for Southeast/Central-West, South, Northeast, and North subsystems.
• Capacity Reserve Auctions Coordination and execution of capacity reserve auctions to secure adequate power supply within the SIN. The March capacity reserve auction contracted approximately 19 gigawatts of power capacity to ensure system adequacy during peak consumption periods.
• Battery Energy Storage Dispatch Control Service Dispatch control service for battery energy storage assets connected to the SIN under system usage agreements, established through the regulatory framework approved by ANEEL. ONS will control dispatch of storage assets participating in Brazil's first national battery energy storage auctions.
• Transmission Expansion Planning Studies (POTEE) Six-year electricity transmission expansion plan preparation service. ONS provides technical studies used in developing the POTEE, which MME releases and ANEEL implements through bidding processes for transmission infrastructure investments.

Quantifiable outcome

• 98% improvement in operational communication efficiency in 2024
• +3 more outcomes

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Five partnerships are on record, tiered core.

• VoltaliacoreStrategic or Co-development Partner · 8 June 2026Voltalia, a French renewable energy company, signed a Transmission System Use Agreement (CUST) with ONS securing 322 megawatts of grid connection capacity at the Pecém Industrial and Port Complex in Ceará, Brazil. The agreement positions Voltalia as a strategic energy partner for data center operators, with plans to develop dedicated wind power projects to meet growing demand for reliable, decarbonized electricity.
• ANEEL / Brazilian Energy Storage AssociationcoreStrategic or Co-development Partner · 4 June 2026ONS participated in developing the regulatory framework for energy storage systems approved by ANEEL on June 2, 2026. The framework establishes that ONS will control dispatch for storage assets with system usage agreements, following public consultation from December 2024 to January 2025.
• ANEEL (Agência Nacional de Energia Elétrica)coreTechnology or Integration · 29 January 2026Brazil's energy regulator ANEEL works with ONS for the 2025 Electric Power Transmission Subsidies Plan (POTEE 2025). ONS provides technical studies that ANEEL validates and uses to authorize transmission infrastructure investments. ANEEL conducts bidding processes for projects based on ONS recommendations.
• MME (Ministry of Mines and Energy) / EPE (Energy Research Company)coreStrategic or Co-development Partner · 2 October 2025ONS collaborates with Brazil's Ministry of Mines and Energy (MME) and its research arm EPE (Empresa de Pesquisa Energética) to prepare the six-year electricity transmission expansion plan (POTEE). ONS provides technical studies used in developing the plan, which MME releases and ANEEL implements through bidding processes.
• AVEVAcoreTechnology or Integration · 29 July 2025ONS integrated AVEVA PI System with its energy management platform, achieving a 98% improvement in operational communication efficiency and avoiding $11.4 million in losses in 2024. This technology partnership enables real-time data analytics and operational intelligence for grid management.

Scale indicators6 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• MISO (Midcontinent Independent System Operator): Independent System Operator managing the bulk electric grid across 15 U.S. states and one Canadian province, performing real-time dispatch, capacity auctions, and transmission planning analogous to ONS's role over Brazil's SIN.
• PJM Interconnection: Largest competitive U.S. grid operator coordinating wholesale electricity markets, capacity auctions, and transmission planning across 13 states — directly comparable to ONS in scale, dispatch function, and capacity-market operations.
• California ISO (CAISO): Operates California's bulk power grid with high renewable penetration and real-time market dispatch — closely mirrors ONS's challenge of integrating large shares of wind and solar while maintaining reliability.
• ERCOT (Electric Reliability Council of Texas): Independent System Operator managing ~90% of Texas load with similar operational focus on real-time dispatch, reliability, and renewable integration — a structural analog to ONS in size and mandate.
• Red Eléctrica de España (REE / Redeia): Spanish TSO operating as Transmission System Operator and System Operator for the Iberian Peninsula — comparable mix of hydro, wind, and solar dispatch coordination with national grid mandate similar to ONS.
• TenneT: European TSO operating high-voltage transmission grids across the Netherlands and Germany, with significant offshore wind integration — comparable in transmission planning, dispatch control, and renewable curtailment management.
• ISO New England: Independent System Operator covering the six New England states, performing capacity auctions, real-time dispatch, and transmission planning — operational analog to ONS despite smaller geographic footprint.

Broad incumbents

• National Grid ESO (UK): System Operator for Great Britain's electricity grid within the larger National Grid plc — comparable real-time balancing, capacity market, and renewable integration role though embedded in a broader commercial parent.
• ENTSO-E: European Network of Transmission System Operators for Electricity — coordination body for 39 European TSOs, structurally analogous to ONS's role coordinating Brazil's SIN across multiple regional subsystems.

Regional players

• Transelec (Chile): Chile's main transmission system operator and asset owner — comparable South American transmission grid operator with similar renewable curtailment and integration dynamics, though operates as a commercial asset owner rather than a non-profit ISO.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about ONS