The Security Premium of Reliable Energy: Quantifying the Trade-off Between Load Criticality and Economic Viability in Off-Grid Systems

Abstract Achieving deep decarbonization in off-grid industries is often hindered by the strict reliability requirements of critical loads, a factor frequently overlooked in standard techno-economic assessments. This study quantifies the "Security Premium" as the economic penalty incurred to guarantee 100% reliability by contrasting non-critical and critical load scenarios under identical climatic conditions in Ibri, Oman. Using SAM and RETScreen simulations, the results reveal a stark divergence in viability determined by load criticality. The non-critical PV-Wind-Battery system is highly profitable, achieving a Net Present Value (NPV) of $86.5 million and a competitive LCOE of 27 ¢/kWh. In contrast, the critical industrial system requires a 5.0 MW diesel baseload to prevent supply interruption. This configuration yields a negative NPV of -$31.8 million, effectively quantifying the Security Premium required to support essential industrial operations. While the critical system is economically challenging, it delivers a massive environmental benefit by reducing CO₂ emissions by over 19,000 tons/year. These findings demonstrate that without specific policy interventions, such as reliability tariffs or carbon credit mechanisms to offset the Security Premium, the hybridization of critical off-grid sectors will remain financially unviable.