An underground pumped storage scheme in the Bukit Timah Granite of Singapore

Wong, Ing Hieng

doi:10.1016/s0886-7798(96)00035-1

Cited by 39 publications

(32 citation statements)

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“…PSH plants cannot be constructed in flat areas and are commonly placed in mountainous regions. Their construction often generates controversy due to the effects on the land use, landscape, vegetation and wildlife caused by the reservoirs (Wong 1996). These are not negligible because of the large dimensions of the considered reservoirs, which are usually large to increase the amount of stored energy.…”

Section: Introductionmentioning

confidence: 99%

Underground pumped storage hydroelectricity using abandoned works (deep mines or open pits) and the impact on groundwater flow

et al. 2016

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Underground pumped storage hydroelectricity (UPSH) plants using open-pit or deep mines can be used in flat regions to store the excess of electricity produced during low-demand energy periods. It is essential to consider the interaction between UPSH plants and the surrounding geological media. There has been little work on the assessment of associated groundwater flow impacts. The impacts on groundwater flow are determined numerically using a simplified numerical model which is assumed to be representative of openpit and deep mines. The main impact consists of oscillation of the piezometric head, and its magnitude depends on the characteristics of the aquifer/geological medium, the mine and the pumping and injection intervals. If an average piezometric head is considered, it drops at early times after the start of the UPSH plant activity and then recovers progressively. The most favorable hydrogeological conditions to minimize impacts are evaluated by comparing several scenarios. The impact magnitude will be lower in geological media with low hydraulic diffusivity; however, the parameter that plays the more important role is the volume of water stored in the mine. Its variation modifies considerably the groundwater flow impacts. Finally, the problem is studied analytically and some solutions are proposed to approximate the impacts, allowing a quick screening of favorable locations for future UPSH plants.

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Section: Introductionmentioning

confidence: 99%

Underground pumped storage hydroelectricity using abandoned works (deep mines or open pits) and the impact on groundwater flow

et al. 2016

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“…Underground pumped storage has been studied as an alternative to conventional aboveground pumped storage, requiring available topography and consideration of environmental impact. The underground pumped storage can be constructed by setting the upper reservoir aboveground and the lower reservoir and powerhouse underground [33,34]. In the case of conventional underground pumped storage, the unit cost of the excavation increases with depth, a deep borehole was drilled into the rock strata below the mine where the powerhouse would be located.…”

Section: Constant-pressure Caes System Combined With Pumped Hydro Stomentioning

confidence: 99%

Potential and Evolution of Compressed Air Energy Storage: Energy and Exergy Analyses

Kim

Lee

Kim

et al. 2012

Entropy

145

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Abstract:Energy storage systems are increasingly gaining importance with regard to their role in achieving load levelling, especially for matching intermittent sources of renewable energy with customer demand, as well as for storing excess nuclear or thermal power during the daily cycle. Compressed air energy storage (CAES), with its high reliability, economic feasibility, and low environmental impact, is a promising method for large-scale energy storage. Although there are only two large-scale CAES plants in existence, recently, a number of CAES projects have been initiated around the world, and some innovative concepts of CAES have been proposed. Existing CAES plants have some disadvantages such as energy loss due to dissipation of heat of compression, use of fossil fuels, and dependence on geological formations. This paper reviews the main drawbacks of the existing CAES systems and presents some innovative concepts of CAES, such as adiabatic CAES, isothermal CAES, micro-CAES combined with air-cycle heating and cooling, and constant-pressure CAES combined with pumped hydro storage that can address such problems and widen the scope of CAES applications, by energy and exergy analyses. These analyses greatly help us to understand the characteristics of each CAES system and compare different CAES systems. OPEN ACCESS

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“…PSH is the most mature technology and account for 99% of bulk storage capacity worldwide [2], because allows large amounts of energy to be stored and generated. PSH plants imply environment impacts on landscape and society [3]. An alternative could be UPSH plants in disused mining structures.…”

Section: Introductionmentioning

confidence: 99%

Comparing Subsurface Energy Storage Systems: Underground Pumped Storage Hydropower, Compressed Air Energy Storage and Suspended Weight Gravity Energy Storage

Menéndez¹,

Schmidt²,

Loredo

2020

E3S Web Conf.

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In the current energy context, intermittent and non-dispatchable renewable energy sources, such as wind and solar photovoltaic (generation does not necessarily correspond to demand), require flexible solutions to store energy. Energy storage systems (ESS) are able to balance the intermittent and volatile generation outputs of variable renewable energies (VRE). ESS provide ancillary services such as: frequency, primary and voltage control to the power grid. In order to fulfil the power system control, ESS can switch within seconds for different operation modes. Many times, ESS imply environment impacts on landscape and society. To solve this problem, disused underground spaces, such as closed mines, can be used as underground reservoir for energy storage plants. In this paper, a comparative analysis between underground pumped storage hydropower (UPSH), compressed air energy storage (CAES) and suspended weight gravity energy storage (SWGES) with suspended weights in abandoned mine shafts is carried out. Pumped storage hydropower (PSH) is the most mature concept and account for 99% of bulk storage capacity worldwide. The results obtained show that in UPSH and CAES plants, the amount of stored energy depends mainly on the underground reservoir capacity, while in SWGES plants depends on the depth of the mine shafts and the mass. The energy stored in a SWGES plant (3.81 MWh cycle-1 with 600 m of usable depth assuming 3,000 tonne suspended weight) is much lower than UPSH and CAES plants.

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An underground pumped storage scheme in the Bukit Timah Granite of Singapore

Cited by 39 publications

References 0 publications

Underground pumped storage hydroelectricity using abandoned works (deep mines or open pits) and the impact on groundwater flow

Underground pumped storage hydroelectricity using abandoned works (deep mines or open pits) and the impact on groundwater flow

Potential and Evolution of Compressed Air Energy Storage: Energy and Exergy Analyses

Comparing Subsurface Energy Storage Systems: Underground Pumped Storage Hydropower, Compressed Air Energy Storage and Suspended Weight Gravity Energy Storage

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