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The Swiss TIMES Energy System Model (STEM), developed by the Energy Economics Group at the Paul Scherrer Institute (PSI), has become a vital tool for guiding Switzerland's energy transition. Initiated in 2006 with support from the Swiss Federal Office of Energy, STEM underwent rapid development and now encompasses the entire Swiss energy landscape, addressing the decarbonization of electricity and transport, renewable integration, biomass utilization, and hydropower's strategic role.

As of 2025, STEM has been crucial in informing the Energy Perspectives 2060 and has expanded to support analyses beyond Switzerland, including a national model for New Zealand. Recent advancements aim to account for non-CO₂ greenhouse gases and assess climate change impacts. STEM's sophisticated features and comprehensive data make it a leading energy-economic model worldwide, essential for evidence-based policy analysis.