With its capital Pyongyang experiencing chronic power shortages, the nation is doubling down on energy storage hydropower stations - a hybrid solution combining traditional hydropower with modern storage tech.
The pressure diversion system is an important hydraulic construction of the pumped storage power station; it mainly consists of the upper reservoir, headrace tunnel, upper surge chamber, penstock, casing, turbine pump, draft tube, downstream surge chamber, tailwater.
The PSH cost model calculates capital costs for a closed-loop PSH system that requires two new reservoirs, with NREL giving a range of $1999 to $5505 per KW for pumped hydro CAPEX cost. The proposed scale of the Onslow project requires a considerable investment of at least NZ$4.
The proposed project will include a 15,000 MW solar power station, a green hydrogen production plant, and a pumped storage hydropower station, all part of Egypt's broader strategy to maximize the use of its natural resources and promote energy transition.
It works by creating a "virtual battery" by supplying solar electricity during peak daylight hours, while balancing the grid with hydropower during times of low solar irradiation and overnight. Solar power will typically rise during the dry season, when reservoir levels are likely.
In power generation, fossil output dropped 2% in the first half of 2025 year-over-year, while wind and solar generation soared 16% and 43%, respectively.
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