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An international study reported by pv magazine indicates that integrating utility-scale solar photovoltaic arrays with a specific form of gravity-based storage could achieve a very low levelized cost of energy in certain parts of the United States. The research suggests that hydraulic hydro storage, paired with solar generation, could provide gigawatt-hour-scale, cost-competitive, and reliable long-duration storage with minimal environmental footprint.
The analysis examined 936 sites nationally using a multi-objective capacity optimization model to evaluate the technical and economic feasibility of such large-scale integrations. According to the researchers, this work establishes a first comprehensive geospatial benchmark for giga-scale hydraulic hydro storage combined with utility-scale solar photovoltaics, moving beyond prior studies that focused on smaller systems or single-site models.
The proposed system configuration involves a solar array, an aggregated commercial district load representing two thousand buildings, and the hydraulic hydro storage unit acting as an energy buffer. When solar production exceeds demand, surplus electricity drives a reversible pump-turbine to lift a solid rock piston, storing energy as gravitational potential. To generate power, the weight of the piston descends, driving pressurized water through the turbine.
The construction method would utilize standard mining techniques to cut the piston from bedrock and install a sealing membrane. A key characteristic is that storage capacity scales dramatically with the piston’s radius, enabling very large-scale energy reserves. The scientists noted that, unlike traditional pumped hydro storage, this approach does not depend on significant elevation differences, potentially broadening where it can be deployed.
For the modeling, photovoltaic panels were assigned a specific efficiency and optimal orientation, while the storage system was assumed to have an 80% round-trip efficiency with eight hours of storage duration. Load profiles were developed from typical meteorological year data, and an optimization routine balanced achieving a low levelized cost of energy against maintaining high reliability, measured by loss of load probability.
The study identified that in high-potential regions, the levelized cost of energy can reach a notably low figure because revenue from exporting surplus solar power helps offset capital and operational expenses. The system was reported to achieve high self-sufficiency at a district scale, with a levelized cost of storage that is competitive with utility-scale batteries for long-duration applications. Across the analyzed climates, storage requirements and photovoltaic capacity needs varied, with a majority of locations achieving an asset-level levelized cost below a specified threshold while maintaining strong reliability performance.
The academics emphasized that the feasibility of such giga-scale projects is heavily dependent on local policy frameworks. They identified state-specific power purchase agreement structures and regional photovoltaic capital costs as primary factors determining a system’s relative performance. For the technology to reach its full potential, site selection must align favorable geological conditions with supportive electricity market designs.
The findings were detailed in a paper published in the journal Energy Conversion and Management, with contributions from researchers at the University of Waterloo in Canada and Cairo University in Egypt.
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