The capacity of a plant is defined as the total electrical power (in MW) and water (in m3/day), which can be delivered by the plant under specific environmental conditions (Reference Site Conditions). The contractual capacity of Sohar plant is 585 MW and 6,250 m3/hr, constant over the 15 years period of the PWPA. The performance tests conducted to date show performance better than the guarantees (see the graph below). This capacity is expected to decline over the period of PWPA due to normal degradation of plant but is expected to remain above 585 MW and 6,250m3/hr and meet contractual requirements under the PWPA.
Availability is the amount of time the plant is technically capable of generating power and water as per specifications. Under the PWPA, Sohar plant shall be available for 100% of time in summer period; and 85% of the time for power and 87% of the time for water in the winter period. Forced Outages of 1.4% and 1.9% for power plant and the water plant respectively have been assumed in the Company budget.
The total power made available during 2014 was 4,628.4 GWh which works to an availability of 90.3%. The total water made available during 2014 was 50,096,856 m3 which works to an availability of 91.5%.
The reliability of the plant is the ability of the plant to deliver the declared availability, as per PWPA. Any failure to deliver the declared capacity will be treated as forced outage. The objective of Sohar Power is to minimize these forced outages, in order to maximize its revenues. During 2014 the plant showed reliability of 99.5% for power and 98.9% for water.
Plant Efficiency (Heat Rate)
The efficiency of the power plant is measured in terms of the amount of heat required to produce one unit of power. Demonstrated efficiency in the original performance test was better than contractual requirements under the PWPA, thus bringing an upside to the Company.
The Contracted Heat Rate is 8,997 MJ/MWh for natural gas; the initial performance tests demonstrated a heat rate of 8,512 MJ/MWh.
Utilization; Energy and Water Delivered
During the year 2014 the energy delivered was 3,497.3 GWh with a utilization factor of the power plant of 75.6%. The total water delivered by the water plant was 48,875,592 m3 with a utilization factor of 97.6%.
Evolution of statistics for power and water capacity made available by Sohar Power and amount delivered to the grid, since Commercial Operation Date of the Plant is depicted in the following charts.
Annual maintenance of all equipment was undertaken during the year.
Based on their fleet experience across the world, the Original Equipment Manufacturers (“OEM”) of major equipment notify their users on various improvements or issues to be addressed in order to improve efficiency, safety or mitigate risks identified in their equipment. SPC alongwith its Operator are working on a few such recommendations.
SPC and its Operator have diligently studied and rectified during the year various causes for fuel inefficiency, which led to unnecessary drain on profitability. This is an ongoing exercise and due attention is being given to this aspect.
Other productivity and efficiency improvements to existing equipment, systems and processes have been implemented during the year and some others are being analysed, jointly with SOMC.