Sembcorp Acquires Stake in Aster Power as Singapore Refinery Sector Consolidates

Strategic Foothold in Refinery Power

Sembcorp Industries has agreed to acquire a 20 percent stake in Aster Power, the clean energy business unit of Singapore oil refiner Aster Chemicals and Energy, according to the company. Sembcorp Utilities, a wholly owned subsidiary, signed the transaction on July 29, though financial terms were not disclosed.

The arrangement grants Sembcorp exclusive rights to supply natural gas to Aster Power, locking in a long-term relationship that extends beyond the equity investment. The deal remains subject to regulatory clearance and completion of transaction documentation.

Aster Chemicals, an 80:20 joint venture between Indonesian petrochemicals player Chandra Asri and commodities trader Glencore, established Aster Power in October 2025 as a dedicated vehicle for clean power solutions, steam generation, and renewable energy projects. The parent company made headlines last year when it acquired Shell's Pulau Bukom refinery and a portfolio of energy and chemicals assets on Jurong Island, while Chandra Asri separately bought ExxonMobil's retail fuel station network in Singapore.

Expanding Industrial Energy Infrastructure

Sembcorp's capital will support what both parties describe as Aster Power's next phase of expansion, including upgrades to power, steam, and renewable energy capacity. The investment positions Sembcorp deeper into Singapore's industrial energy landscape, where large refineries and chemical complexes require reliable, round-the-clock utilities.

Koh Chiap Khiong, chief executive of Sembcorp Singapore, said the partnership offers potential to better serve the changing requirements of Singapore's industrial sector. Aster group CEO Erwin Ciputra noted that Sembcorp's involvement as an investor provides a stronger foundation for growth.

Aster Power had previously contracted Sembcorp Solar Singapore to deploy 16 megawatt-peak of solar capacity across Aster's Pulau Bukom and Jurong Island sites, with installation scheduled to complete by the end of this year. The unit has also announced plans to invest 150 million US dollars in a hydrogen-ready gas turbine with heat integration for its parent company's chemical facilities.

Jurong Island's Energy Transition

The transaction reflects broader trends reshaping Singapore's refining and petrochemicals hub. Jurong Island, home to some of the world's largest integrated energy complexes, faces mounting pressure to decarbonize as the city-state pursues net-zero targets and tightens emissions regulations. Refiners and chemical producers are seeking partners with the technical capacity and balance sheet to finance cleaner power infrastructure.

Sembcorp brings experience operating combined-cycle gas turbines, cogeneration plants, and utility-scale solar arrays across Singapore and the wider Asia-Pacific region. The company has been pivoting toward renewables and lower-carbon energy sources, while maintaining its traditional gas-fired generation and district cooling businesses.

For Aster, the partnership offers operational certainty and access to Sembcorp's fuel procurement networks. Natural gas supply arrangements are critical for refineries running continuous processes, where interruptions can trigger expensive shutdowns and safety risks.

OCBC is serving as Aster Power's exclusive financial adviser and financing partner for current and future growth initiatives, the companies said.

Market Reaction

Sembcorp Industries shares rose 0.15 Singapore dollars, or 2.8 percent, to close at 5.57 Singapore dollars on July 29, following the announcement. The stock move suggests investors view the deal as strategically sound, adding a captive customer and recurring revenue stream in a sector with high barriers to entry.

Singapore's refining sector has undergone significant consolidation over the past two years, with Shell, ExxonMobil, and other Western majors exiting or divesting legacy assets. Regional players, particularly from Indonesia and India, have stepped in to acquire refineries and downstream infrastructure, betting on continued demand for refined products across Southeast Asia even as the energy mix shifts toward lower-carbon sources.

The Sembcorp-Aster Power agreement underscores how utilities and industrial energy users are forging closer ties to manage transition risk and capital intensity. As refiners install hydrogen-capable turbines, carbon capture systems, and renewable capacity, they increasingly rely on specialist energy partners rather than building everything in-house.

Completion of the transaction is expected within the next few months, pending regulatory sign-off. Both companies said they would provide further updates once formalities are concluded.