ENHANCING RENEWABLE ENERGY CAPACITY THROUGH PUMPED STORAGE SYSTEMS: A CASE STUDY
H. M. H. N. Bandaranayake1, T. Bambaravanage2*, K. G. C. J. Senarathna3, D .N. Thalagala4, L. U. Bhagya5, and H. M. C. L. Bandara6
1, 2, 3, 4, 5, 6 Institute of Technology University of Moratuwa, Sri Lanka
Session: Technical Session B
Abstract
Sri Lanka aims at achieving 70% of its power generation from renewable energy sources by 2030 to meet its electricity demand. To this end, various approaches are being explored to generate electricity with minimal or no emissions. Among these, wind and solar photovoltaic (PV) energy are becoming increasingly popular. Due to their intermittent and non-dispatchable nature, it is crucial to utilize harnessed energy whenever it is available. A Pumped-Storage System (PSS) is an effective solution for storing excess energy in the national grid. This approach helps meet peak demand with cost-effective electricity, generated from more environmentally friendly technologies. An extensive survey was conducted to identify a suitable location, referencing a 1: 10,000 map of Sri Lanka, research papers, and technological reports. The researchers propose a PSS with a capacity of 2 MW based on the Maussakele Reservoir which plays a pivotal role in Sri Lanka’s hydropower generation. The upper pond for the PSS is a natural pool situated in Laxapana tea plantation. The natural elevation difference between the two reservoirs enhances the energy storage capacity. Excess energy from the national grid during off-peak hours will be stored as potential energy and subsequently converted into hydroelectricity during peak hours. The effectiveness of the proposed scheme has been validated through mathematical analysis. Accordingly, the annual expected electricity generation of 1,460 MWh would result in saving of over LKR hundred million under the current economic scenario of Sri Lanka positively to the national economy. Furthermore, the proposed PSS is designed to minimize the impact on ecosystems, habitats, and the environment,
Keywords: generation, hydropower, pump storage, renewable energy
DOI: 10.64752/UMRU3623