PHES
Pumped Hydro Energy Storage (PHES) accounts for 95% of global energy storage capacity and is 10 times cheaper than batteries, with lowest levelised cost of electricity due to 100 year operationality compared with 10 years for batteries. PHES needs an upper and a lower reservoir conected through a penstock and water is recirculated between them, by pumping water from the lower reservoir into the upper one, when low demand and electricity prices in the grid, and let the water falls back through the reversible turbine pump, on pick demand and prices. Energy storage paired with renewable generation will boost the penetration of renewables globaly according to "Finkel report"​
One Lake Pumped Hydro Energy Storage (OLPHES), is a renewable energy technology owned by Canberra based company Energy Storage Rights that holds the regional IP rights for Australia, Indonesia, Philippines, New Zealand, Romania and 10 other pacific countries, granted by Innsbruck University, Austria.
ONE LAKE PUMPED HYDRO ENERGY STORAGE
The technology has the following characteristics: · single reservoir – removing the need for a 2nd reservoir and associated infrastructure, thereby reducing CAPEX by > 50% compared with the standard 2 reservoir project · can be installed in gulfs, mine pit lakes, as well as reservoirs, and off-shore; the deeper the water body, the higher its storage capacity · modular & scalable – enabling standardised components to be manufactured off-site, agglomerated to a desired scale and deployed in paralel with a floating or standard solar farm. OLPHES can store 1 MWh into a concrete cylinder with 20 m radius and 20 m height, that floats on a lake, like in the above animation, has a reversible pump-turbine at the bottom, that is powered by solar or wind energy. Increasing the hight of the cylinder to 100 m, the storage capacity increases to 5 MWh, generating 1MW for 5 hours. OLPH its easily to scale up further 10 times, by floating 9 similar cylinders, that are positioned circular and share the reversible pump-turbine with the central one by connecting pipes.​ OLPHES light can be build from inflatable rubber cylinders.