Energy Efficiency Analysis of the Glass Office Building of PT Pertamina Patra Niaga-ITJ in the Context of Climate Resilience

A Study Based on the Energy Audit Report

Abstract

High energy consumption in office buildings remains a critical challenge in achieving climate-resilient infrastructure, especially in tropical countries like Indonesia. This study analyzes the energy efficiency performance of a glass-façade office building owned by PT Pertamina Patra Niaga-ITJ, based on findings from an internal energy audit conducted in 2023. The audit revealed that the building’s energy consumption, particularly for air conditioning and artificial lighting, far exceeds national efficiency standards. With an Energy Consumption Intensity (IKE) of 246.567 kWh/m²/year, which is well beyond the threshold of 100-150 kWh/m²/year, the building is classified as inefficient. The primary cause is identified as the fully glazed façade, which lacks adequate thermal protection and significantly increases solar heat gain. This results in a high reliance on mechanical cooling systems and increased operational costs. The study emphasizes the urgency of integrating passive retrofit strategies, such as fixed external shading devices, double-skin façades, and green roofs, to reduce thermal loads and improve building performance. While no physical intervention was proposed, the study provides a strategic foundation for future design improvements aligned with climate resilience goals. These findings support the role of regular energy audits as essential tools for sustainable building management and informed retrofit planning in tropical urban contexts.