Yaupi

• In April, the optic fiber was installed between the Yuncán, Santa Isabel and Yaupi reservoirs.
• In April and July, preventive maintenance was performed on the five generation units.
• The drawings of the protection, control and instrumentation systems were updated.
• The level measuring system of the Yuncán intake dam was upgraded.

Malpaso

• Preventive maintenance was performed on the protection, control and instrumentation systems of the four generation units.
• Information on the instrumentation was compiled, and databases prepared.

Cahua

• In January, preventive maintenance was performed on the two generation units.
• In February, the turbine of generation unit No.2 was replaced.
• In June, the turbine and the watertight rings of the inlet valve in generation unit No.1 were replaced.
• In June, the partial discharge equipment was installed in the two generation units.
• The cellphone communication system was implemented at the plant.
• In December, the overhaul was conducted on the intake, the headrace tunnel, the plant and associated transmission lines.
• Voltage relief works were performed on generators to extend their life.
• By improving the oil-hydraulic system of generation unit No.1 (replacement of the distributor servomotor, change of proportional valves and reconfiguration of the control system), the temperature rises that have been occurring were controlled.
• Flow, temperature and oil level sensors were replaced and installed in generation units.
• A phone and a satellite phone were installed for communication from the forebay and the Cahua Intake, respectively.
• Differential protection was installed in order to improve the protection of 10 kV busbars.

Gallito Ciego

• In March and September, preventive maintenance was performed on the two generation units.
• In June, partial discharge equipment was installed in the two generation units.

Pachachaca

• In January and October, preventive maintenance was performed on the three generation units.

La Oroya

• In June, preventive maintenance was conducted on generation unit No.1
• In April, the gasket in the spherical joint of turbine A of generation units No.2 and No.3 was replaced.
• In June, preventive maintenance was performed on generation units No.2 and No.3.
• In August, the two butterfly valves of generation unit No.2 were replaced.

Arcata

• In July, the transformer covers were replaced at the Huayllacho HPP, which resolved the issue of the sudden plant outage due to a voltage variation.

Pariac

• In August, planned maintenance was performed on generation units No.1 and No.2 in HPP2.
• In February and May, planned maintenance was performed on generation units No.1 and No.2 in HPP3.
• In February and August, planned maintenance was performed on generation units No.1 and No.2 in HPP4.

Main maintenance activities were the following:

• Preventive maintenance on 220/50/13.8 kV transformers bank at the Oroya Nueva substation.
• Preventive maintenance on 50kV transmission lines L-6535, L-6532, L-6533 and associated cells in the San Mateo, Carlos Francisco, Casapalca and Antuquito substations.
• Preventive maintenance of 50 kV transmission lines L-6529, L-6530 de 50 kV and associated cells in the Nueva Morococha and Pachachaca substations.
• Preventive maintenance of 50 kV Mahr Túnel substation.
• Preventive maintenance of 69 kV line L-6601 and the Chumpe and Oroya Nueva substations.
• Maintenance of 50 kV lines L-6514 and L-6515 and associated cells in the Carhuamayo Substation.
• Preventive maintenance of 50 kV lines L-6516 and L-6517 and associated cells in the Carhuamayo substation.
• Preventive maintenance of lines L-6520, L-1704 and the Paragasha I and Huicra substations.

• The optic fiber system was implemented in the Shelby SS – Excélsior SS – Paragsha I SS.
• The WAN network bandwidth was optimized in Yaupi, Cahua and Malpaso HPPs.
• The industrial and corporate data networks were separated in Yaupi and Cahua HPPs.
• A structured cabling system was installed in Cahua HPP.
• The microwave system layout was optimized in Lima, Suche Hill link – Pardo y Aliaga building – Torre Real building, in order to move the communication system to the new office in Lima.
• The office for the Cheves Project handover team and the office in Lima were integrated with the optic fiber link Cheves SS – Huacho SS and Internexa communication service Huacho SS – Lima office.