PT SOMA Daya Utama (“Company”) was established on 2010 in Jakarta, Indonesia, with the aim of providing energy to local businesses and residences within the Zone 1 Area of FTZ (Free-Trade Zone) in Karimun, Riau Islands. This zone, in addition to be a Free-Trade Zone which grants the Company many advantages for trade activities, is also adjacent to Singapore and Malaysia and enables fast cross-border shipments. PT SOMA Daya Utama develops and operates a 2 x 31 MW (installed capacity) Coal-Fired Steam Power Plant including 20 kV Distribution Network at Karimun, Province of Riau Islands, Indonesia. The Project aims to provide benefits to the various industries operating within the Zone I Area of FTZ (Free Trade Zone) of Karimun. SDU will supply electricity within the exclusive area approximately 4,328.7 Hectares of Zone I FTZ, with current total industrial load demand ± 60 MW with the expectation of increasing demand in the future.
Pre-Feasibility Study report was launched in 2012 and the company bought its site of production the year after.
In 2014 and 2015, PT SOMA Daya Utama acquired their main licenses to be able to operate a power plant.
- Environment Impact Analysis license for power plant.
- Environment Impact Analysis license for distribution line.
- Integrated Electric Power Supply license.
The final evaluation of the EPC Contractor has happened in 2018 and the commencement of the project construction is set to start in 2019 with a 37 target months completion because of the pandemic COVID-19 issue. The company expects its first revenues coming in Q3-2022.
This plant will provide power benefits to the various industries, residences & businesses within The Zone I Karimun Area, of FTZ (Free Trade Zone) of Karimun island. After a market study, the Company targeted this particular area as it was in dire need of electricity.
The Company has already secured contracts (comprising to date over 70% of the envisaged capacity) in Karimun, which serves as a testimony to the Company credentials and qualifications for embarking on the ambitious coal & renewable projects. The company has planned, developed and will begin the construction of that plant in 2019. Initial construction operations have begun May 2019. This 2 x 31 MW (installed capacity) Coal-Fired Steam Power generation plant, including a 20 kV distribution network, is located in Karimun regency, Riau Islands province, Indonesia.
The Company will utilize the Circulating Fluidized Bed Combustion (CFBC) technology used is an advanced coal combustion technology used to improve overall cycle system efficiency in electricity generation.
During the seventies and eighties, it appeared that the conventional pulverized coal-fired power plants had reached a limit in terms of thermal efficiency. The efficiency levels achieved were of the order of 40 percent in the US and the UK. The corresponding figures for India, however, were lower at 36 to 37 percent. An alternative technology, the CFBC was developed to raise the efficiency levels.
In this technology, high pressurized air is blown through fine ground coal particles. These particles will be entrained in the air and form a floating or fluidised bed. This bed behaves like a fluid in which the constituent particles move hectically and collide with one another. Fluidised bed can be used with a variety of fuels such as coal, biomass, petro-coke, coal cleaning waste and wood. This bed contains only around 5 percent of coal or fuel. The rest of the bed is primarily an inert material such as ash or sand.
The temperature in the CFBC is around 800-900°C compared with the 1,300 to 1,500°C in a pulverized coal combustion (PCC) technology. Low temperature helps minimize the production of NOx. With the addition of a sorbent into the bed (mostly limestone), much of the SO2 formed can be captured.
The other advantages of the CFBC technology is the compactness, ability to burn using low calorific values (as low as 1,800 kcal/kg) and production of ash which is less erosive. Moreover, in CFBC, oil support is needed for 20-30 percent of the load versus 40-60 percent in PCC. CFBC-based plants also have lower capital costs compared to PCC-based plants. The capital costs could be 8-15 percent lower.
CFBCs essentially consist of two types bubbling and circulating. While bubbling beds have low fluidisation velocities to prevent solids from being elutriated, circulating beds employ high velocities to actually promote elutriation. Both these technologies operate at atmospheric temperature. The circulating bed can remove 90-95 percent of the sulphur content from the coal while the bubbling bed can achieve 70-90 percent removal.
Electrical Distribution System
The purpose of the electrical distribution system is to transmit power using conductors to different parts of the utility franchise area. These lines typically use medium voltage to circulate the power needed by the consumers. Distribution lines is said to be the final stage before satisfying the consumers or end-users and when power is delivered to them.
Typical voltage used in a distribution system is in the medium voltage level (not more than 50kV). Similar to transmission lines, the choice of distribution voltage is in the utility discretion primarily depending on the economic factors and choice of equipment. The choice of voltage is said to be the deciding factor on what type of distribution transformers to be used, insulators to be installed, and structure designs to be followed.
Typical construction of distribution lines is consisting mainly of poles, insulators, connectors and wires. Also, widely used set up for distribution lines is an overhead type similar to that of a transmission line system. However, in some countries especially those with highly urbanized areas uses underground distribution system by using power cables and cabinet substations.
The networks of these distribution lines are typically categorized into two, radial system and interconnected system.
Radial system starts in the substations and goes to consumers area as their supply with no connection to other supplies. This set-up can usually be found in rural areas where a utility needs to supply isolated service points.
Soma Karimun plant project has an embedded 20 kV electrical distribution grid system as electric power interconnection from the power plant location into various offtakers location. The type of 20 kV distribution line is medium voltage cable overhead line.
The electric power generated by the Soma plant will be distributed by two 20 kV distribution lines with antenna (radial) system to the industry and public load. The first 20 kV distribution line consist of two circuits (double circuit) and the second 20 kV distribution line consist of three circuits (triple circuit).
Two 20 kV distribution lines are located adjacent to the existing access road.
A load flow system analysis study, Power System Study, and losses study will be conducted prior to the basic engineering stage to calculate and analysis from any trouble and interruption in the electrical distribution system during future operational stage with comprehensive operation and maintenance standard procedure planning.
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