Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónima

Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónima, commonly known as CAMMESA, is the Argentine company responsible for administering the Mercado Eléctrico Mayorista, or MEM, and coordinating the Argentine Interconnection System. It was created in 1992 during a broad restructuring of Argentina's electricity sector. The reform divided formerly integrated public electricity businesses into separate generation, transmission and distribution companies and established a market framework intended to encourage competition, investment and more transparent dispatch of electricity. CAMMESA operates as a private sociedad anónima with a distinctive public-private ownership structure. Market participants, including generation and transmission companies, distributors and large electricity users, collectively hold most of the shares, while the Argentine state retains a minority stake. The company is therefore not a conventional investor-owned utility or a retail electricity supplier. Its role is primarily institutional and operational: it coordinates the dispatch of electricity, administers market settlements, supports system planning, manages transactions in spot and contract markets, and coordinates electricity exchanges with neighboring countries. A central function is the dispatch of generation into the interconnected grid. CAMMESA assesses expected demand, available generating capacity, transmission constraints, fuel availability and the operating characteristics of power plants in order to determine how electricity should be produced and delivered. It also evaluates future capacity requirements and contributes to planning for the reliability and expansion of the national system. Through its market-administration functions, it records transactions and manages the financial relationships between generators, distributors, transmission participants and large users. The company's position has been shaped by Argentina's electricity-pricing and subsidy policies. After the economic crisis and currency devaluation around the turn of the 2000s, retail and wholesale electricity pricing became heavily regulated, while mechanisms for adjusting tariffs were constrained. In periods when regulated customer tariffs did not fully reflect the cost of generation, CAMMESA became an important channel through which the gap between market costs and regulated revenues was managed. The resulting payment obligations and transfers made the company dependent on public financial support to meet payments to generators and other market participants. This is a structural feature of its role in the electricity system rather than evidence that CAMMESA itself is a retail electricity brand. Since 2013, CAMMESA has also played a centralized role in procuring and administering fuel for thermal generators participating in the wholesale market. A temporary relaxation of this arrangement was available from November 2018 through December 2019, after which centralized fuel procurement was restored. The arrangement gives CAMMESA a major coordinating function over the availability and cost of natural gas and other fuels used by thermal power stations. CAMMESA has additionally acted on behalf of Argentina's energy authorities in renewable-energy procurement. Following the passage of Law 27.191, the RenovAr program used competitive auctions, financing incentives and tax benefits to encourage new renewable generation. CAMMESA supported the auction and contracting process, while the government established renewable-energy targets and technology-specific parameters. The first two auction rounds approved dozens of projects representing several gigawatts of planned capacity, helping expand the institutional role of the company beyond conventional market settlement and dispatch. CAMMESA's activities are consequently best understood as the operating infrastructure of Argentina's wholesale electricity system. It does not primarily market electricity to households under a consumer brand. Instead, its public-facing importance lies in system coordination, dispatch, settlement, capacity planning, fuel administration, cross-border exchanges and implementation of selected government energy programs.

CAMMESA emerged from Argentina's comprehensive electricity-sector reform of 1992. The reform was implemented through the Electricity Regime Law 24.065, adopted during a period of privatization and restructuring of state-owned enterprises. Previously integrated public electricity companies were separated into generation, transmission and distribution businesses. The new structure sought to introduce competition in generation, attract private investment and make dispatch and market transactions more transparent. The law called for a national dispatch organization to be established as a sociedad anónima. Executive Decree 1192 implemented that requirement by creating CAMMESA. The same reform established the Mercado Eléctrico Mayorista, Argentina's wholesale electricity market. CAMMESA was assigned the practical functions needed to make that market operate, including coordinating the Argentine Interconnection System, dispatching generation, administering market transactions and planning for future system requirements. CAMMESA's governance reflects its hybrid status. It is legally a private company, but its shareholders include the principal classes of participants in the wholesale electricity market, such as generators, transmission companies, distributors and large users. The Argentine government holds the remaining minority interest. The board structure gives market participants and the state roles in appointing directors, with senior energy officials participating in governmental representation and exercising important influence over decisions. This arrangement allows CAMMESA to operate as a market institution while remaining closely connected to public energy policy. The company's operating environment changed significantly after Argentina's economic crisis and peso devaluation around 2001. Electricity tariffs and pricing mechanisms became strongly regulated, and inflation adjustments were restricted or frozen. Wholesale prices were managed through rules associated with the variable cost of gas-fired generation, even when the actual costs of different plants, fuels and operating conditions differed. Because regulated revenues did not always cover the cost of electricity supplied, CAMMESA became an intermediary for the resulting financial imbalance. It paid or coordinated payments to generators and relied on public subsidies and transfers when market collections were insufficient. From 2013, CAMMESA also centralized fuel procurement for thermal generators. The company purchased and administered fuel required by participating thermal plants, giving it an important role in coordinating generation inputs and managing supply risk. A limited period of greater supplier choice ran from November 2018 until December 2019, but the centralized model was later restored. This function links the company's wholesale-market responsibilities with Argentina's broader fuel and energy policy. CAMMESA's responsibilities extend beyond daily dispatch. It monitors the operation of spot and term wholesale markets, optimizes the use of available generation and transmission resources, evaluates capacity needs, and coordinates electricity exchanges with other countries. Its technical and settlement functions make it a central institution for the operation of Argentina's interconnected grid, even though it is not primarily a retail supplier or a power-generation company. A further expansion of its policy role came with Argentina's renewable-energy program. Law 27.191 established targets intended to raise renewable energy's share of the national electricity mix to 20% by December 2025. The RenovAr program used competitive auctions, tax incentives and financing support to attract investment in wind, solar, biomass, small hydropower and other eligible technologies. CAMMESA administered the auction process on behalf of the Secretary of Energy, receiving project proposals, applying procurement parameters and supporting the resulting contracting framework. The first round in 2016 approved 59 projects with more than 2,400 MW of planned capacity; the second round in 2017 approved 88 projects totaling about 2,042 MW. CAMMESA therefore occupies a distinctive position in Argentina's energy system. Its legal form is private, its ownership is shared between market participants and the state, and its day-to-day work is technical and commercial. At the same time, tariff controls, subsidies, fuel policy and renewable-energy targets have made it an important instrument of public policy. Its historical development reflects the tension between competitive electricity-market design and the continuing role of government in financing, regulating and directing Argentina's power sector.

• 2017

  RenovAr Round 2

  [1]Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónimaen.wikipedia.org

  The second auction round approves 88 projects totaling approximately 2,042 MW.

• 2016

  RenovAr Round 1

  [1]Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónimaen.wikipedia.org

  The first renewable-energy auction round approves 59 projects representing more than 2,400 MW.

• 2013

  Centralized fuel purchasing begins

  [1]Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónimaen.wikipedia.org

  CAMMESA begins centralizing required fuel purchases for thermal generation in the wholesale market.

• 1992

  CAMMESA is created

  [1]Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónimaen.wikipedia.org

  Executive Decree 1192 created CAMMESA as the national electricity-dispatch and wholesale-market administration company during Argentina's electricity-sector reform.

A system operator and wholesale-market administrator rather than a consumer-facing electricity retailer or generator.

• Wholesale electricity-market administration · 1992

  Mercado Eléctrico Mayorista administration

  CAMMESA administers Argentina's wholesale electricity market, including the coordination of participating generators, transmission companies, distributors and large users. Its functions include market monitoring, transaction administration, dispatch-related calculations and the operation of spot and term market mechanisms.

• Power-system operations · 1992

  Argentine Interconnection System coordination

  The company coordinates electricity dispatch across Argentina's interconnected system. It compares demand with available generation, considers network and plant constraints, and seeks to use the national power system efficiently while supporting reliability and system planning.

• Energy-input procurement · 2013

  Thermal-generation fuel administration

  CAMMESA purchases and administers fuel used by thermal generators participating in the wholesale market. This responsibility centralizes an important part of supply planning and cost management for gas-fired and other thermal generation, subject to changes in government policy.

• Renewable-energy procurement · 2016

  RenovAr auction administration

  On behalf of Argentina's energy authorities, CAMMESA administered competitive renewable-energy auctions under the RenovAr program. Developers submitted investment and pricing proposals, while the program used technology parameters, target volumes, tax incentives and financing support to encourage new renewable capacity.

• 2017RenovAr Round 2

  Argentina

  The second RenovAr auction widened the renewable procurement effort and approved 88 projects representing approximately 2,042 MW.

  Outcome. The round expanded the contracted project pipeline and reinforced CAMMESA's role in implementing Argentina's renewable-energy targets.

  Source
• 2016RenovAr Round 1

  Argentina

  CAMMESA supported the first round of Argentina's RenovAr renewable-energy procurement program after the adoption of Law 27.191. The auction approved 59 projects with planned capacity exceeding 2,400 MW.

  Outcome. The round created an initial pipeline of large-scale renewable projects and established competitive auctions as a policy tool for expanding Argentina's renewable electricity supply.

  Source

• 2016

  Implementation of RenovAr renewable-energy auctionsProduct launch

  Background

  Law 27.191 established a policy framework seeking to increase renewable energy's share of Argentina's electricity mix to 20% by December 2025.

  Action taken

  CAMMESA administered competitive procurement rounds on behalf of the Secretary of Energy, using project proposals and technology-specific price and volume parameters.

  Aftermath

  The first two rounds approved a substantial pipeline of renewable projects and broadened CAMMESA's role in national energy policy implementation.

  Source

• 2013

  Centralization of thermal-generator fuel procurementStrategy

  Background

  Argentina sought greater coordination of fuel supply for thermal power plants participating in the wholesale market.

  Action taken

  CAMMESA was assigned responsibility for purchasing and administering required fuel for thermal generation.

  Aftermath

  The company gained a larger role in managing generation inputs and the operational economics of thermal power plants.

  Source

• 1992

  Establishment of a wholesale-market administratorStrategy

  Background

  Argentina's Electricity Regime Law required a national dispatch function within a restructured electricity market based on separated generation, transmission and distribution activities.

  Action taken

  Executive Decree 1192 created CAMMESA as a private company to coordinate dispatch and administer the wholesale electricity market.

  Aftermath

  CAMMESA became the central operating and settlement institution for Argentina's interconnected wholesale electricity system.

  Source

• 2018

  Temporary relaxation of centralized fuel purchasing[1]Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónimaen.wikipedia.org

  Regulation

  A temporary period allowed thermal power plants to select alternative fuel suppliers between November 2018 and December 2019. Centralized procurement was subsequently reinstated.

• 2017

  RenovAr Round 2 expands renewable procurement[1]Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónimaen.wikipedia.org

  Campaign · Product launch · Regulation

  The second RenovAr auction approved 88 renewable-energy projects representing approximately 2,042 MW of planned capacity.

• 2016

  RenovAr renewable-energy auction program begins[1]Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónimaen.wikipedia.org

  Campaign · Product launch · Regulation

  Following Argentina's renewable-energy legislation, CAMMESA administered the first RenovAr procurement round on behalf of the national energy authorities. Fifty-nine projects totaling more than 2,400 MW were approved.

• 2013

  CAMMESA assumes centralized fuel procurement for thermal generators[1]Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónimaen.wikipedia.org

  Regulation

  Thermal-generation companies were required to obtain needed fuel through CAMMESA, strengthening the company's coordinating role in generation supply and fuel administration.

• 1992

  Creation of CAMMESA under Argentina's electricity-sector reform[1]Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónimaen.wikipedia.org

  Regulation · Other

  Executive Decree 1192 established CAMMESA as the company responsible for the national dispatch function within the electricity-market framework created by Argentina's electricity-sector reform.

1. 1Compañía Administradora del Mercado Mayorista Eléctrico Sociedad Anónimaen.wikipedia.org
2. 2CAMMESA official websitecammesa.com