Modern industries require a stable, efficient, and sustainable power supply. One widely used solution is the captive power plant (CPP), a self-contained power-generation facility built to meet a company’s internal energy needs.
With a CPP, companies can reduce their reliance on the public power grid while improving operational efficiency. This system enables better energy management. Let’s take a closer look at what a captive power plant is in this article!
What Is a Captive Power Plant?
A captive power plant is a power generation facility built and operated by a company or industry to meet its own electricity needs, not for sale to the public.
This system is primarily used by industries that require large, stable amounts of electricity, such as cement plants, petrochemical facilities, and heavy manufacturing.
In principle, a captive power plant converts energy from fuel into electricity that industrial facilities use directly, without passing through the public grid.
The process begins with the combustion of fuels such as natural gas or coal to generate thermal energy, which is then converted into mechanical energy via engines or turbines.
This mechanical energy drives a generator, producing electricity that is then fed directly into the plant’s internal grid to support operations.
Although technologies vary, ranging from solar power to steam turbines, the most commonly used technology in small- and mid-scale industries for independent electricity generation is the reciprocating gas engine (a mechanical device that uses a reciprocating piston to convert thermal energy from combustion into mechanical work).
So, why is the reciprocating gas engine such a widely used technology? Here are some reasons:
- Relatively low capital costs.
- A wide range of size options.
- Fairly high electrical conversion efficiency.
- Operationally reliable.
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Why Are Captive Power Plants the Solution?
According to the International Energy Agency, global energy consumption in 2024 reached 450 EJ, with nearly 40% coming from the industrial sector.
Since 2019, the industrial sector has also accounted for about two-thirds of global electricity consumption growth. These figures indicate that industrial energy demand continues to rise significantly.
Without a stable and adequate electricity supply, companies risk disruptions in their production processes. Therefore, captive power plants (CPPs) provide a means to ensure operational continuity and a reliable energy supply.
In terms of electricity supply reliability, industries such as manufacturing, petrochemicals, and data centers cannot tolerate power outages, even for a matter of seconds. With a captive power plant, companies can ensure a stable and consistent electricity supply.
In terms of efficiency and cost control, a CPP allows companies to generate their own electricity, thereby reducing additional expenses such as transmission costs, electricity price fluctuations, and peak-hour surcharges. In the long term, this makes energy costs more manageable.
Additionally, a CPP offers operational flexibility. Companies can adjust electricity capacity to match production needs, making energy usage more efficient and controlled without waste.
CPPs also support energy independence. Dependence on external parties, such as public electricity providers (e.g., PLN) or public electricity distribution networks, can be reduced, thereby minimizing the risk of supply disruptions and distribution limitations.
In line with these needs, Indonesia’s captive power plants have grown significantly. Data from the JETP Indonesia Secretariat indicates that CPP capacity will reach 25.9 GW by 2024, with over 75% still dominated by coal-fired power plants.
Types of Captive Power Plants
Industries can choose from various types of CPPs to suit their needs. The choice is based on the operational scale, energy source availability, and the company’s sustainability goals. Here are some types of captive power plants:
1. Renewable Energy-Based Captive Power Plant
A renewable energy captive power plant is an independent power generation facility that uses environmentally friendly energy sources, such as solar, wind, hydro, or biomass, to meet industrial electricity needs.
This type of CPP is becoming increasingly popular because it offers lower long-term operational costs and supports efforts to reduce carbon emissions.
One example of a reliable, environmentally friendly, renewable energy-based CPP in Indonesia is the solar energy solution provided by Krakatau Chandra Energi (KCE).
As #YourGrowthPartner and a subsidiary of the Chandra Asri Group, Chandra Daya Investasi, through PT Krakatau Chandra Energi, supplies electricity with a generation capacity of approximately 120 megawatts to support energy needs in the Krakatau Industrial Estate.
KCE’s solar panel installations are divided into several systems: on-grid, off-grid, on-grid with battery backup, and hybrid solar systems. These solar panel solutions are specifically designed to meet the needs of each industry.
Meanwhile, the area's electricity supply is also supported by PT Krakatau Posco Energy through a 200-megawatt steam power plant and a transmission network capable of up to 150 kilovolts.
All of this infrastructure is managed by Chandra Daya Investasi, a subsidiary of the Chandra Asri Group, which focuses on energy infrastructure development and ensuring a reliable electricity supply.
2. Fossil Fuel-Based Captive Power Plants
As the name implies, fossil fuel-based captive power plants use energy sources such as coal, natural gas, or diesel to generate electricity for industrial needs.
This type of CPP can provide a stable and high-capacity electricity supply. Therefore, industries with high energy demands, such as steel, cement, or textiles, rely heavily on this system to maintain smooth operations.
However, fossil fuel-based CPPs face challenges, including rising fuel costs and environmental concerns, such as high carbon emissions and increasingly strict regulatory pressure on fossil fuel use.
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3. Hybrid Captive Power Plant
A hybrid captive power plant combines two or more energy sources into a single system, typically integrating fossil fuels with renewable energy. This approach allows companies to leverage the advantages of each energy source simultaneously.
Practically speaking, renewable energy sources such as solar power are used to reduce operational costs, while fossil fuels like natural gas or diesel serve as a backup when the renewable energy supply is insufficient. With this approach, companies can maintain power stability while reducing their reliance on a single energy source.
4. Group Captive Power Plants
Group captive power plants are power plants jointly owned and managed by several companies. Instead of building their own plants, each party contributes to the investment and then uses electricity according to their respective shares.
This model allows companies to obtain a more economical energy supply without bearing the entire cost themselves. Additionally, this scheme also facilitates access to large-scale energy projects, including renewable energy, which might be difficult to achieve individually.
That concludes the information on captive power plants (CPP). By understanding their functions and types, you can assess how CPPs can serve as a strategic solution to ensure the stability of the company's electricity supply.
If you want to optimize energy use for your business, trust Krakatau Chandra Energi (KCE) to meet your needs!
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