Universitas Negeri Semarang (UNNES) continues to strengthen its commitment to environmental sustainability by integrating energy efficiency principles into campus infrastructure development. Through its institutional Green Building Policy, the university promotes energy-efficient construction, building renovation, and sustainable facility management in alignment with Indonesian National Standards (Standar Nasional Indonesia/SNI).
This initiative supports UNNES’s long-term commitment to achieving carbon neutrality by 2045, as stipulated in Rector’s Decree No. B/3669/UN37/HK.02/2024, and reinforces Rector’s Circular Letter No. B/28595/UN37/PA.00.00/2024 concerning Green Buildings.
Through its Green Building Policy, UNNES emphasizes the importance of integrating sustainability considerations throughout the lifecycle of campus buildings, from initial planning and construction to operation, maintenance, and renovation. Energy efficiency considerations include optimizing natural lighting and ventilation, selecting efficient air conditioning equipment, reducing unnecessary cooling loads, and improving building energy management. In addition to SNI 6390:2011, other relevant Indonesian building energy conservation standards provide complementary technical references, including SNI 6197:2020 concerning energy conservation in lighting systems and SNI 6389:2011 concerning energy conservation in building envelopes. Together, these standards provide a framework for improving building energy performance while maintaining a comfortable and productive environment for academic activities.
The university’s inventory demonstrates extensive adoption of energy-saving technologies across various categories of electrical equipment. Among the 15,843 LED lighting units recorded, 15,063 units (95%) were classified as energy efficient. Similarly, 21,434 of 23,338 fluorescent lighting units (92%) met the inventory’s energy efficiency classification. Energy-efficient technologies have also been incorporated into cooling systems. Of the 1,904 air conditioning units installed across university facilities, 1,557 units (82%) were identified as energy efficient. Other equipment categories showed similarly high levels of energy efficiency, including 702 of 762 LCD projectors (92%), 1,724 of 1,877 personal computers (92%), and 147 of 167 Smart TVs (88%). These figures demonstrate that energy efficiency considerations extend beyond lighting and cooling systems to encompass the technological infrastructure supporting teaching, research, and administrative operations.
Beyond the number of energy-efficient appliances, UNNES has implemented various technologies designed to optimize electricity consumption within campus buildings. Motion-sensor lighting has been installed in selected restrooms, allowing lights to operate automatically when movement is detected.
Outdoor lighting systems incorporate light sensors, timers, and solar-powered technologies to minimize unnecessary electricity use during daylight hours. LED lighting has also been widely implemented in classrooms, offices, corridors, and other university facilities. In addition, energy-efficient fluorescent lighting, including Philips Essential TL5 14W lamps classified under energy efficiency class A in the university’s report, is used alongside reflectors that improve light distribution.
In building cooling systems, UNNES utilizes air conditioning equipment equipped with digital inverter technology. These include four-way cassette systems for larger rooms and wall-mounted air conditioning units designed to optimize cooling performance while reducing energy demand. Such technologies support more efficient building operations while maintaining
