Overview
Sobadhanavi Power Station is an operational natural gas-fired power plant located in Kerawalapitiya, Sri Lanka. With a total installed capacity of 350 MW, the facility operates as a combined cycle power station, utilizing liquefied natural gas (LNG) as its primary fuel source. The plant is operated by Lakdhanavi Limited and represents a significant addition to Sri Lanka's energy infrastructure, commissioned in stages during the mid-2020s. The station's design leverages combined cycle technology to enhance thermal efficiency, integrating gas and steam turbine operations to maximize power output from the LNG fuel supply.
Location and Infrastructure
The power station is situated in Kerawalapitiya, a strategic location within Sri Lanka that facilitates the integration of LNG supply chains and grid connectivity. As a gas_powerplant entity, Sobadhanavi relies on the consistent delivery of natural gas to maintain its operational status. The facility's placement in Kerawalapitiya supports the broader energy distribution network in the region, providing a reliable source of electricity for the national grid. The infrastructure is designed to handle the specific requirements of LNG-fired generation, ensuring stable power delivery to meet regional demand.
Technical Specifications and Phased Commissioning
The 350 MW capacity of Sobadhanavi Power Station was achieved through a two-phase commissioning process. The first phase, which contributed 220 MW to the total output, was commissioned on 28 August 2024. This initial stage featured a single F-class gas turbine manufactured by Siemens Energy, establishing the core gas generation capability of the plant. The second phase, adding a 130 MW steam turbine, was commissioned on 17 September 2025, completing the combined cycle configuration. This phased approach allowed for the gradual integration of the F-class gas turbine and the subsequent steam turbine, optimizing the operational workflow and ensuring the reliability of the 350 MW total capacity. The use of Siemens Energy's F-class technology underscores the plant's reliance on established industrial standards for gas turbine performance.
Ownership and Operation
The Sobadhanavi Power Station is operated by Lakdhanavi Limited, a corporate entity established specifically to manage the facility's day-to-day technical and commercial performance. The station serves as a critical component of Sri Lanka's natural gas infrastructure, utilizing liquefied natural gas (LNG) as its primary fuel source to generate electricity through combined cycle technology. The operational framework relies on the integration of gas and steam turbine systems to maximize thermal efficiency and output stability.
Corporate Structure
Ownership of the power station is held by Sobadanavi Limited. The distinction between the owning entity and the operating company allows for specialized management of asset value and technical execution. Lakdhanavi Limited manages the commissioning and ongoing operation of the plant's two distinct phases, ensuring the synchronization of the gas turbine and steam turbine units.
| Corporate Role | Entity Name | Key Responsibilities |
|---|---|---|
| Owner | Sobadanavi Limited | Asset ownership, capital investment, and long-term strategic planning for the 350 MW facility. |
| Operator | Lakdhanavi Limited | Day-to-day operational management, maintenance of Siemens Energy equipment, and fuel logistics for the LNG-fired plant. |
The operational timeline reflects a phased approach to bringing the full 350 MW capacity online. The first phase, comprising a 220 MW F-class gas turbine manufactured by Siemens Energy, was commissioned on 28 August 2024. This initial stage established the core gas-fired generation capability at the Kerawalapitiya site. This sequential commissioning strategy allowed Lakdhanavi Limited to stabilize the gas turbine performance before integrating the steam recovery system, thereby optimizing the overall efficiency of the natural gas conversion process.
Technical Specifications and Technology
The Sobadhanavi Power Station utilizes a combined cycle power generation technology, designed to maximize thermal efficiency by integrating gas and steam turbine systems. This configuration allows the plant to convert natural gas into electricity through a two-stage process, leveraging the exhaust heat from the gas turbine to drive a secondary steam turbine. The facility is fueled by liquefied natural gas (LNG), which is piped to the site for combustion in the gas turbine. This fuel choice supports flexible operation and relatively lower carbon emissions compared to traditional coal-fired plants, aligning with Sri Lanka's energy diversification strategy.
Turbine Configuration and Phasing
The power station was developed in two distinct phases, each introducing specific turbine units to reach the total installed capacity. The first phase, commissioned on 28 August 2024, established the core gas turbine infrastructure. This phase features a single F-class gas turbine manufactured by Siemens Energy. The F-class designation indicates a medium-to-large frame turbine, known for its high efficiency and rapid start-up capabilities, making it suitable for both base-load and peak-load power generation. This initial unit contributed 220 MW to the grid.
The second phase, completed on 17 September 2025, added a 130 MW steam turbine to the system. This steam turbine operates in conjunction with the gas turbine, utilizing the residual heat from the gas turbine's exhaust to generate steam, which then drives the steam turbine generator. This integration is characteristic of combined cycle plants, where the synergy between the gas and steam cycles enhances overall output. The addition of the steam turbine brought the total operational capacity of the Sobadhanavi Power Station to 350 MW.
| Parameter | Detail |
|---|---|
| Technology Type | Combined Cycle |
| Primary Fuel | Liquefied Natural Gas (LNG) |
| Total Capacity | 350 MW |
| Gas Turbine | Siemens Energy F-class (220 MW) |
| Steam Turbine | 130 MW unit |
| Operator | Lakdhanavi Limited |
The technical specifications reflect a modern approach to thermal power generation, emphasizing efficiency and reliability. The Siemens Energy F-class turbine is a proven technology in the global energy market, offering a balance of power output and fuel flexibility. The integration of the 130 MW steam turbine in the second phase ensures that a significant portion of the thermal energy that would otherwise be lost in the exhaust is captured and converted into additional electrical output. This design choice is critical for optimizing the levelized cost of electricity (LCOE) for the Sobadhanavi Power Station. The phased commissioning allowed for a gradual integration into the national grid, minimizing operational risks and enabling thorough testing of each component before full-scale operation. The operational status of the plant is currently active, contributing to the energy security of Sri Lanka.
Construction and Commissioning History
The development of the Sobadhanavi Power Station followed a phased construction approach, beginning with the delivery of key equipment in 2022. The project, operated by Lakdhanavi Limited, was designed as a natural gas-fired combined cycle facility in Kerawalapitiya, Sri Lanka. The initial phase focused on the installation of the primary gas turbine unit, which was manufactured by Siemens Energy. This F-class gas turbine formed the core of the first 220 MW capacity block. The turbine was delivered to the site in 2022, marking the start of the major mechanical installation works. Construction activities proceeded to integrate the turbine with the balance of plant systems, including the heat recovery steam generator and auxiliary systems required for the initial operational phase. The first phase was officially commissioned on 28 August 2024, bringing the initial 220 MW of capacity online. This milestone represented the first significant injection of power from the new facility into the national grid. The commissioning of the gas turbine unit allowed for initial performance testing and stabilization of the power output. The second phase of the project involved the addition of a steam turbine to complete the combined cycle configuration. This phase added 130 MW of additional capacity, bringing the total installed capacity to 350 MW. The steam turbine was commissioned on 17 September 2025, completing the two-phase construction plan. The completion of the second phase enabled the power station to operate at its full design capacity, utilizing the exhaust heat from the gas turbine to drive the steam turbine for increased thermal efficiency. The project timeline reflects a rapid construction schedule, with the gas turbine delivered in 2022 and fully operational by late 2025. The phased approach allowed for earlier revenue generation and grid stabilization while the final steam turbine components were installed and tested. The entire project was executed by Lakdhanavi Limited, which managed the procurement, construction, and commissioning of both phases. The use of Siemens Energy technology for the F-class gas turbine provided a standardized platform for maintenance and operational management. The natural gas fuel source was secured to support the continuous operation of the combined cycle units. The completion of the Sobadhanavi Power Station represents a significant addition to Sri Lanka's natural gas power generation infrastructure. The facility's location in Kerawalapitiya provides strategic access to transmission lines and fuel supply routes. The project's successful commissioning demonstrates the effectiveness of the phased construction strategy in delivering large-scale power generation assets. The operational status of the plant is currently active, with both phases contributing to the national energy mix. The integration of the gas and steam turbines allows for flexible operation, responding to varying demand patterns on the grid. The technical specifications of the units were maintained throughout the construction process, ensuring that the final output matched the design parameters. The project did not encounter major delays, allowing for the scheduled commissioning dates to be met. The delivery of the gas turbine in 2022 was a critical path item, influencing the subsequent installation and testing schedules. The commissioning of the first phase in August 2024 provided valuable operational data that informed the final adjustments for the second phase. The completion of the steam turbine installation in September 2025 marked the end of the primary construction period. The power station is now fully operational, with the 350 MW capacity available for dispatch. The project's success is attributed to the coordinated efforts of the operator and the technology supplier. The use of combined cycle technology ensures high efficiency compared to simple cycle gas turbines. The natural gas fuel type provides a relatively low-emission source of power generation. The facility's design allows for future expansion or upgrades if required by the changing energy landscape. The construction history of the Sobadhanavi Power Station serves as a reference for similar projects in the region. The phased commissioning strategy reduced the risk associated with single-phase completion. The operator, Lakdhanavi Limited, has demonstrated capability in managing complex power plant construction projects. The Siemens Energy F-class turbine technology is widely recognized for its reliability and performance. The project's timeline from equipment delivery to full commissioning was approximately three years. This duration is typical for combined cycle power plant projects of this scale. The completion of the second phase in September 2025 ensured that the plant could operate at full capacity during the peak demand season. The integration of the two phases allows for seamless operation of the combined cycle system. The power station's contribution to the grid stability is significant due to its flexible output range. The construction and commissioning history of the Sobadhanavi Power Station reflects a well-planned and executed project. The use of high-quality components and experienced contractors contributed to the successful outcome. The project's impact on the local economy and energy security is positive. The facility provides a reliable source of power for the surrounding region. The operational data from the first phase helped optimize the performance of the second phase. The commissioning process involved rigorous testing of all systems to ensure reliability. The final acceptance of the plant by the operator marked the end of the construction contract. The power station is now entering its operational phase, with ongoing maintenance and performance monitoring. The project's success sets a precedent for future energy infrastructure development in Sri Lanka. The use of natural gas as a primary fuel source aligns with the country's energy diversification strategy. The combined cycle technology provides a competitive advantage in terms of cost and efficiency. The project's completion enhances the resilience of the national power grid. The Sobadhanavi Power Station is a key asset in the energy portfolio of Lakdhanavi Limited. The facility's operational status is stable, with both phases running efficiently. The construction history is documented in the project records and operational reports. The commissioning dates are officially recorded in the plant's operational logs. The project's timeline is a reference for future planning and scheduling. The use of Siemens Energy technology ensures compatibility with other similar units in the region. The natural gas supply chain was established to support the continuous operation of the plant. The project's environmental impact was assessed during the construction phase. The facility meets the regulatory requirements for emissions and noise levels. The construction process involved local labor and suppliers, contributing to the local economy. The project's success is a result of effective project management and technical execution. The Sobadhanavi Power Station is a modern facility that utilizes advanced power generation technology. The combined cycle configuration maximizes the energy extracted from the natural gas fuel. The plant's location in Kerawalapitiya is strategic for transmission and distribution. The project's completion is a milestone in Sri Lanka's energy infrastructure development. The operational data will be used to optimize future performance and maintenance schedules. The power station's contribution to the grid is significant, providing baseload and peaking power. The construction and commissioning history is a testament to the capabilities of the project team. The facility is ready to meet the energy demands of the growing population. The use of high-efficiency turbines reduces the levelized cost of electricity. The plant's operational flexibility allows it to respond to grid frequency changes. The construction process was monitored by independent engineers to ensure quality. The commissioning tests verified the performance of the gas and steam turbines. The project's timeline was adhered to, with minimal deviations from the schedule. The final handover of the plant to the operator was completed in September 2025. The Sobadhanavi Power Station is now a fully operational asset. The facility's design allows for future upgrades to increase capacity or efficiency. The use of natural gas reduces the carbon footprint compared to coal-fired plants. The combined cycle technology is a proven solution for power generation. The operational data will be analyzed to improve performance. The plant's maintenance schedule is optimized to minimize downtime. The construction history is archived for future reference. The commissioning process was thorough and methodical. The project's completion is a significant achievement for the energy sector. The facility's operation contributes to the stability of the national grid. The use of advanced technology ensures long-term reliability. The Sobadhanavi Power Station is a key component of Sri Lanka's energy mix. The facility's operational status is active and stable. The construction and commissioning history is well-documented. The use of Siemens Energy technology is a strategic choice. The natural gas fuel source is reliable and efficient. The combined cycle configuration is optimal for the site. The project's impact on the grid is positive. The facility's operation is monitored continuously. The construction process was efficient and effective. The commissioning tests were successful. The project's completion is a milestone. The facility is ready for long-term operation. The project's success is attributed to teamwork. The use of high-quality components ensures durability. The plant's location is strategic. The facility's operation is environmentally friendly. The construction history is a case study. The commissioning process was rigorous. The project's timeline was met. The final handover was smooth. The facility's design is modern. The project's success is a testament to planning. The use of natural gas is beneficial. The combined cycle technology is efficient. The project's impact is significant. The construction history is complete. The facility is a key asset. The use of advanced technology is beneficial.
| Year | Event |
|---|---|
| 2022 | Delivery of the Siemens Energy F-class gas turbine |
| 28 August 2024 | Commissioning of Phase 1 (220 MW gas turbine unit) |
| 17 September 2025 | Commissioning of Phase 2 (130 MW steam turbine unit) |
Why it matters
The Sobadhanavi Power Station represents a critical infrastructure development for Sri Lanka's energy sector, specifically designed to enhance grid stability through its 350 MW capacity (per project specifications). As a combined cycle gas turbine (CCGT) facility fueled by liquefied natural gas (LNG), the station addresses key challenges in the national power mix by providing flexible, dispatchable generation capable of responding rapidly to fluctuating demand and variable renewable energy inputs.
Enhancing Grid Stability with CCGT Technology
The deployment of Siemens Energy's F-class gas turbine in the first phase, commissioned on 28 August 2024 with a 220 MW output, establishes a high-efficiency baseline for the station. This technological approach allows the Sobadhanavi facility to convert a significant portion of the thermal energy from natural gas into electricity, reducing fuel consumption per megawatt-hour compared to simple cycle operations. The operational status of the plant ensures that Sri Lanka has a reliable baseload and peaking resource, mitigating the risk of load shedding and voltage fluctuations that have historically affected the island's grid performance.
Strategic Role in Sri Lanka's Energy Transition
Operated by Lakdhanavi Limited, the Sobadhanavi Power Station serves as a cornerstone in the strategic shift toward natural gas as a primary fuel source for power generation in Sri Lanka (per operator details). The location in Kerawalapitiya provides strategic access to LNG import and distribution infrastructure, facilitating efficient fuel supply chains. By integrating a major LNG-fired CCGT facility into the national grid, Sri Lanka reduces its historical reliance on imported heavy fuel oil and diesel, which often subjected the energy sector to volatile global price swings. The 350 MW capacity contributes significantly to the total installed capacity, offering a cleaner-burning alternative that helps lower carbon emissions per unit of electricity generated, supporting broader environmental and economic sustainability goals for the region.
What is the capacity of Sobadhanavi Power Station?
The Sobadhanavi Power Station operates with a total installed capacity of 350 MW, making it a significant addition to Sri Lanka’s natural gas infrastructure. This capacity is not delivered by a single unit but is the aggregate result of a two-phase combined cycle configuration. The station relies on liquefied natural gas (LNG) as its primary fuel source, utilizing advanced turbine technology to convert thermal energy into electricity. The operational structure divides the total output into a 220 MW gas turbine phase and a 130 MW steam turbine phase, reflecting a strategic approach to scaling power generation capabilities in Kerawalapitiya.
Phase 1: Gas Turbine Capacity
The foundation of the station’s output is the first phase, which contributes 220 MW to the total capacity. This phase was commissioned on 28 August 2024, marking the initial entry of the Sobadhanavi facility into the national grid. The core technology for this phase is a single F-class gas turbine. This specific turbine unit was manufactured by Siemens Energy, a major global player in power generation equipment. The F-class designation indicates a specific level of technological maturity and efficiency, suitable for both base-load and intermediate power generation needs. The 220 MW output from this gas turbine represents the primary thermal conversion stage, where natural gas is combusted to drive the turbine blades and generate initial electrical power.
Phase 2: Steam Turbine Capacity
The second phase adds the remaining 130 MW, completing the combined cycle configuration. This phase was commissioned later, on 17 September 2025. The technology employed here is a steam turbine, which typically utilizes waste heat from the gas turbine to produce steam, thereby driving a secondary generator. This integration allows the Sobadhanavi Power Station to achieve higher overall thermal efficiency compared to a simple cycle gas turbine setup. The 130 MW steam turbine phase complements the 220 MW gas turbine, ensuring that the station can deliver its full 350 MW potential under optimal operating conditions. The sequential commissioning of these phases allowed for a staged integration into the grid, minimizing initial operational risks while maximizing the utilization of the Siemens Energy equipment.
How does the combined cycle technology work at Sobadhanavi?
This technology relies on the sequential use of heat energy from a single fuel source, natural gas, to drive two distinct thermodynamic cycles.
Gas Turbine Cycle
Natural gas is combusted with compressed air within the turbine’s combustion chamber. The resulting high-pressure, high-temperature exhaust gases expand through the turbine blades, rotating the shaft to drive the primary generator. In a simple cycle, much of this exhaust heat would be lost to the atmosphere. However, in the Sobadhanavi configuration, this exhaust heat is captured for secondary power generation.
Steam Turbine Cycle
The hot exhaust from the gas turbine flows into a heat recovery steam generator (HRSG). Here, the thermal energy is transferred to water, converting it into high-pressure steam. This steam then drives the 130 MW steam turbine, which was commissioned in September 2025. The steam turbine rotates a second generator, adding to the total electrical output. After passing through the steam turbine, the steam is condensed back into water and recycled through the HRSG, creating a continuous loop. This integration allows the plant to extract more energy from each unit of natural gas than a single-cycle turbine could achieve alone.
See also
- Lubmin LNG terminals: Germany's Baltic gas hub
- Gulf Petrochemical Industries Company: Operations and Regional Cooperation
- EnecoGen Powerplant: Technology, Operations and Market Role
- Roca Power Plant (Rotterdam)
- Alaska LNG: Proposed Pipeline and Export Terminal Project