TECHNICAL FAQ

It is the set of operation and maintenance services that secures the availability, performance and service life of power plants, transmission lines and substations. It covers real-time operation, predictive, preventive and corrective maintenance, and engineering support for the asset owner.

It is maintenance carried out with the circuit energised, without interrupting supply. It calls for certified crews, strict procedures and special equipment. COTESA pioneered the technique in Brazil and performs live-line work at voltages up to 765 kV.

Licensed operating agents, with their own control centre and crews certified in the ONS grid procedures. COTESA runs a 24/7 Operations Centre with a hotline to the ONS regional control centres, representing its clients before the grid operator.

Local and remote operation, pre-operation, real-time and post-operation engineering, preventive and corrective maintenance, asset management and maintenance planning, plus protection, control, automation and telecommunications.

Hydropower plants, photovoltaic solar farms and wind farms, adding up to 7.5 GW under O&M in solar and wind assets and 1.5 GW in hydropower generation.

On high and extra-high voltage assets connected to the Brazilian Basic Grid, including live-line maintenance up to 765 kV with the system energised. The company has built experience in complex systems such as 525 kV substations and HVDC links up to 600 kV.

Yes. The company supports the challenge and defence of performance and Variable Portion (PV) penalties where applicable, with event analysis, oscillography and the technical documentation needed to sustain the case before the parties involved.

Maintenance of transmission lines, substations and equipment on a predictive, preventive and corrective basis, with on-site crews at the plants, technical inspections, event analysis and support for contingencies and emergencies.

Energy-intensive industrial plants that depend on operational safety, reliability and continuity of supply, with medium, high and extra-high voltage electrical systems.

Yes. COTESA provides 24/7 operational support, according to the model contracted, with event analysis and specialist backup.

Because a data center’s continuity depends on an electrical infrastructure prepared to run with control, safety and the ability to respond. As power availability is essential to the business, the SLA comes to depend on the quality of the operation and maintenance of the electrical assets.

Substations, connection bays, transmission lines and associated electrical assets, including extra-high voltage networks connected to the Brazilian National Interconnected System (SIN).

Yes. The work includes technical and regulatory advice before, during and after connection, with document management, compliance with the grid procedures and institutional relations with the ONS, transmission utilities and other parties.

Through COTESA’s 24/7 Operations Centre in Florianópolis, southern Brazil, with remote operation and teleassistance for local operators, plus rapid intervention and crisis management coordination when needed.

Yes. COTESA operates data centers under a shared-services model, applying its experience in electrical asset O&M and 24/7 support.

A specialist management and administration structure for power sector companies, bringing together technical knowledge, structured processes and several support areas in a single solution, with 28 years of sector experience.

Four main fronts: finance, accounting and regulatory affairs; governance, contracts and legal support; procurement and operational support; and people, safety and the environment. Each has a detailed and adaptable scope.

Specialist crews for one-off services, short-duration projects and emergency demands that call for technical knowledge, speed and the ability to mobilise, sized according to the asset and the complexity involved.

Yes, with coordination and technical support after incidents, erection of emergency towers, contingency plans and drills, and event analysis.

Replacement of insulator strings, spacers, dampers and hardware on live or de-energised lines, split shunt splices and OPGW work, insulator washing, electrical testing, earthing measurement, optical fibre testing (OTDR) and hot-spot correction.