Hydroelectric storage, specifically pumped storage, converts electrical energy into gravitational potential energy. The hydroelectric storage market is the sector that builds and operates these systems. The hydroelectric storage market for "utility-scale" is the largest. The hydroelectric storage market for "pumped storage" plants are often co-located with conventional hydroelectric dams (using the same lower reservoir). The hydroelectric storage market for "closed-loop" pumped storage (no natural inflow) is an alternative.

The broader pumped hydroelectric storage turbines market is the equipment. The hydroelectric storage market for "energy" stored is proportional to the water volume and the head. The hydroelectric storage market for "power" (rate of energy release) is limited by the turbine capacity. The hydroelectric storage market for "run-of-river" hydro (no storage) is a different technology.

The hydroelectric storage market for "environmental" impacts include land use, water evaporation (in arid regions), and changes to river flow (for open-loop). The hydroelectric storage market for "closed-loop" systems have lower environmental impact (no river flow alteration). The hydroelectric storage market for "fish" passage is not an issue for closed-loop.

The hydroelectric storage market for "geography" is limited; suitable sites are needed. The hydroelectric storage market for "existing" reservoirs (e.g., from conventional hydro dams) can be converted to pumped storage. The hydroelectric storage market for "off-river" pumped storage (using man-made reservoirs) is more flexible in siting.

The hydroelectric storage market for "cost" is dominated by civil works (reservoirs, tunnels). The hydroelectric storage market for "electro-mechanical" equipment (turbines, generators) is a smaller part.

Looking ahead, the hydroelectric storage market will see the development of "underground" pumped storage (using underground caverns as the lower reservoir). The hydroelectric storage market for "abandoned" mines for lower reservoirs. The hydroelectric storage market for "seawater" pumped storage (using the ocean as the lower reservoir) is being researched.

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