Abstract This white paper presents a systems-theoretic analysis of primary energy sources with a focus on the relationship between power-output stochasticity, thermodynamic reliability, and grid-level stability requirements. The central argument is that the long-term viability of a large-scale energy substrate should not be evaluated solely by its nominal carbon intensity or installed capacity, but by its ability to provide persistent, low-variance, dispatchable energy under realistic operational constraints. Within this framework, intermittent renewable sources such as solar photovoltaic and wind power are treated as high-variance generators whose integration imposes nontrivial balancing, reserve, storage, and transmission costs on the wider system. By contrast, deep geothermal systems, particularly closed-loop deep geothermal architectures, are analyzed as a class of energy technologies capable of delivering near-continuous output with minimal dependence on exogenous climatic conditions. The paper argues that deep geothermal energy represents a uniquely scalable and geographically generalizable candidate for long-duration baseload generation, owing to its high capacity factor, thermodynamic persistence, and compatibility with existing advances in directional drilling, subsurface engineering, and high-temperature materials. Particular attention is given to the distinction between Enhanced Geothermal Systems (EGS) and closed-loop geothermal heat extraction, with the latter offering a potentially superior pathway in terms of operational predictability, induced seismicity mitigation, and deployment flexibility. The principal conclusion is that deep geothermal energy should be considered not merely as one renewable option among many, but as a stability-optimal foundational layer for future energy systems. In a world facing increasing electrification, geopolitical fragmentation, and climate-driven infrastructure stress, energy technologies that minimize systemic volatility may hold greater strategic value than those that merely maximize nominal renewable penetration.
Roman Lukin (Thu,) studied this question.