Gravity energy storage system is an innovative energy storage concept based on the same principle as PHES. This system has attracted attention lately due to the many benefits it provides as it does not require any special geographical requirement [ 39 ].
The results reveal that GES has resulted in good performance metrics including IRR and NPV of project and Equity, as well as ADSCR, and LLCR. In addition, for a 1 GW power capacity and 125 MWh energy capacity system, gravity energy storage has an attractive LCOS of 202 $/MWh.
For Gravity Storage systems, the levelized cost of storage decreases as the system size increases. Based on the system cost, GES with an energy storage capacity of 1 GWh, 5 GWh, and 10 GWh has an LCOS of 202 US$/MWh, 111 US$/MWh, 92 US$/MWh, respectively. This can be explained by the fact that the system CAPEX decreases with an increased capacity.
Its patented technology is based on a simple principle: raising and lowering a heavy weight to store energy. Simple, clever and durable: The technical concept of Gravity Storage uses the gravitational power of a huge mass of rock. Alexander Gillet is a senior editor for EnergyStartups.
The results speak for themselves. Today, Uruguay produces nearly 99% of its electricity from renewable sources, with only a small fraction—roughly 1%–3%—coming from flexible thermal plants, such as those powered by natural gas. They are used only when hydroelectric power cannot fully cover periods when wind and solar energy are low.
Uruguay's shift to renewables, he argues, demonstrated that clean energy can be cheaper, more stable, and create more jobs than fossil fuels. Once the country adjusted the playing field that had long favored oil and gas, renewables outperformed on every front: halving costs, creating 50,000 jobs, and protecting the economy from price shocks.
Once a net importer of energy, Uruguay now exports its surplus energy to neighbouring Brazil and Argentina. In less than two decades, Uruguay broke free of its dependence on oil imports and carbon emitting power generation, transitioning to renewable energy that is owned by the state but with infrastructure paid for by private investment.
Other concerns focus on cost and scalability. While Uruguay's approach has delivered low prices, some energy analysts worry that replicating the model in countries with higher demand could require costly improvements to transmission infrastructure and significantly more storage.
Uruguay's shift to renewables, he argues, demonstrated that clean energy can be cheaper, more stable, and create more jobs than fossil fuels. Once the country adjusted the playing field that had long favored oil and gas, renewables outperformed on every front: halving costs, creating 50,000 jobs, and protecting the economy from price shocks.
Other concerns focus on cost and scalability. While Uruguay's approach has delivered low prices, some energy analysts worry that replicating the model in countries with higher demand could require costly improvements to transmission infrastructure and significantly more storage.
The results speak for themselves. Today, Uruguay produces nearly 99% of its electricity from renewable sources, with only a small fraction—roughly 1%–3%—coming from flexible thermal plants, such as those powered by natural gas. They are used only when hydroelectric power cannot fully cover periods when wind and solar energy are low.
Uruguay did what most nations still call impossible: it built a power grid that runs almost entirely on renewables—at half the cost of fossil fuels. The physicist who led that transformation says the same playbook could work anywhere—if governments have the courage to change the rules.
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