Marchetti's Cold Case Energy Model Needs Revisiting: Competing energy sources in an evolutionary process of substitution?

Abstract This paper critically and heuristically analyzes the famous model of logistical substitution of energy sources developed by Cesare Marchetti and Nebojsa Nakicenovic at IIASA in 1979. Using a "Cold Case" approach, the study compares historical projections with actual data on the global energy mix in 2024-2025, highlighting the profound divergences caused by geopolitical factors and technological accelerations that were unforeseeable at the time. While the original model assumed an orderly and symmetrical transition to nuclear dominance, the current reality shows the "resilience" of coal, the continued role of natural gas as a bridge fuel, and the exponential explosion of renewables. The work also explores the paradox of abundance: the shift from the Age of Scarcity to the Age of Superimposability, where the sum of technological potentials vastly exceeds human needs, shifting the issue from resource availability to the management of competition and profit. Finally, the article addresses the challenges posed by artificial intelligence, whose energy hunger threatens to compete with habitual human uses, and the need to reconsider the role of the state in cutting-edge research (advanced nuclear power and LENR). The article concludes that overcoming Western democratic regimes may depend on the ability to guarantee energy as a public right, avoiding the creation of artificial scarcity induced by speculative dynamics, and critically reconsidering the failure of privatizations in strategic sectors.