SEMARANG — Universitas Negeri Semarang (UNNES) recorded 705,236 kilowatt-hours (kWh) of solar electricity in 2025, equivalent to 2,538.85 gigajoules (GJ). This documented low-carbon energy source represents approximately 6.83% of the university’s estimated total annual energy use of 37,194.08 GJ, based on available electricity and fuel records.
The figures were compiled from the myUNNES-office system for January–December 2025. The report contains 239 monthly solar photovoltaic (PLTS) records across 20 named locations, enabling the university to trace reported energy figures by building and reporting period.
Solar Energy Supports Campus Activities
Reporting locations include the Rectorate, IT Building, Rumah Ilmu, Digital Center, faculty buildings and engineering department buildings. These facilities accommodate administration, teaching and learning, research, information technology and digital services.
The Digital Center recorded the largest annual solar electricity total, at 190,829 kWh. The Faculty of Economics and Business administration building followed with 87,532 kWh, while Rumah Ilmu recorded 72,715 kWh.
Monthly recorded solar electricity ranged from 39,044 kWh in February to 88,299 kWh in December. These variations provide information for further evaluation alongside installation capacity, operating conditions, maintenance records and monitoring completeness.
Measuring the Low-Carbon Energy Contribution
UNNES converted the recorded solar electricity using 1 kWh = 0.0036 GJ, resulting in an annual total of 2,538.8496 GJ.
| Energy measure | 2025 total |
|---|---|
| Recorded solar electricity | 705,236 kWh |
| Equivalent energy from solar PV | 2,538.85 GJ |
| Estimated total university energy use | 37,194.08 GJ |
| Recorded solar contribution relative to estimated total energy use | 6.83% |
The estimated total covers PLN grid electricity, recorded solar electricity and estimated energy from fuel purchased for official vehicles and generators. The reported low-carbon contribution covers solar PV and does not include an assumed low-carbon share of purchased grid electricity.
Building-level records enable UNNES to track the contribution of solar energy across campus facilities and identify priorities for further technical assessment. Continued monitoring can support system maintenance, improve reporting completeness and inform future renewable energy development.
The documented solar contribution provides a measurable foundation for UNNES’s efforts to increase low-carbon energy use and reduce the carbon intensity of campus operations.
