Tan Tock Seng Hospital

Singapore first acute hospital to be awarded Green Mark Platinum Super Low Energy (SLE)

In 2024, Tan Tock Seng Hospital reached a major milestone when its main Medical Block became the first local acute hospital to be awarded the Building Construction Authority’s (BCA) Green Mark Super Low Energy (SLE) certification. The accolade recognises the successful transformation of a 25-year-old hospital, proving that sustainability is achievable even within complex, legacy infrastructure.

This achievement reflects years of deliberate planning, technical innovation, and operational discipline. Teams across engineering, facilities, and operations worked to rethink how energy is generated, managed, and consumed across the campus. The result is a hospital building that delivers the same high standards of patient care, while significantly lowering its environmental footprint. The award signifies more than recognition – it represents a shift in what is possible for public healthcare institutions, setting a benchmark for how older hospitals should evolve to meet tomorrow’s sustainability challenges.

Air-conditioning chillers are the heart of the hospital’s cooling system, supplying chilled water that supports air-conditioning across wards, clinics, and operating theatres. In 2024, the hospital embarked on the end of-life replacement of our chiller system as part of a multi-year hospital renewal programme. The new chillers are designed to operate far more efficiently, delivering the same cooling performance while consuming significantly less electricity.

These upgrades are expected to achieve energy savings of 3,300,000 kWh annually. This is equivalent to the electricity used by more than 770 four-room HDB households each year!