What if pumped hydro was installed in every hilly region? [23]

By -

Summary of the Article: 

Blanketing the world’s hilly regions with closed‑loop pumped storage (two off‑river reservoirs linked by penstock) would unlock terawatt‑scale, long‑duration flexibility at system level—stabilizing high‑renewables grids with synchronous inertia, black‑start capability, and multi‑hour to multi‑day energy shifting. The global technical resource is not the bottleneck: independent geospatial assessments identify hundreds of thousands of prospective sites with storage potential orders of magnitude above what the energy transition needs. The binding constraints are permitting timelines, environmental and social safeguards, site‑specific water availability, and market designs that under‑value long‑duration flexibility. A credible path to scale combines closed‑loop siting away from rivers, standardized sustainability tools, and policy frameworks that remunerate capacity, flexibility, and resilience—not just arbitrage. [cell.com], [re100.eng.anu.edu.au], [hydropower.org]

1) System value—what becomes possible if PSH is everywhere it makes sense

Long‑duration storage at scale. Pumped storage already provides >90% of the world’s grid‑scale storage today, offering multi‑hour to multi‑day shifting that batteries struggle to deliver economically beyond ~4–8 hours. Widespread deployment across hilly regions would extend this dominance and anchor the “long tail” of flexibility needed to integrate very high shares of wind and solar. [hydropower.org], [iea.org]

Grid stability services you can’t get from inverters alone. Large PSH units supply synchronous inertia, frequency and voltage control, spinning reserves, and black‑start—services essential in low‑inertia systems crowded with inverter‑based renewables. Variable‑speed PSH adds regulation in both pumping and generating modes, improving frequency response and efficiency. These attributes materially reduce system operating costs and outage risk at high VRE penetrations. [gevernova.com], [mdpi.com]

Geographic risk diversification. Distributing closed‑loop sites across many hills and plateaus decentralizes storage, reducing single‑basin hydrological risk and easing transmission constraints when co‑located with renewable energy zones (REZs). [cell.com]

2) Is there enough good resource? Yes—by two orders of magnitude

The Australian National University (ANU) global atlas identifies 616,000 potential closed‑loop, off‑river sites with a combined storage potential of ~23,000 TWh, demonstrating that storage resource is not a limiting factor for decarbonization. Many sites are deliberately mapped away from rivers and protected areas, enabling low‑impact siting. [cell.com]

The ANU team’s expanded datasets now list ~820,000 non‑overlapping opportunities totaling ~86 million GWh of potential storage—far beyond what would be required even in 100% renewable scenarios. The atlas is freely accessible and widely used by governments and developers for screening. [re100.eng.anu.edu.au]

Implication: “Every hilly region” is not hyperbole—most countries with hills have numerous off‑river candidates that avoid major dams and sensitive catchments, with ample head and short pressure tunnels. [re100.eng.anu.edu.au]

3) What would it do to the power mix and build‑out trajectory?

Tripling renewables needs a matching storage wave. The IEA and IHA both emphasize that decarbonization to 2030–2050 requires massive additions of storage and flexibility, with PSH remaining the backbone of long‑duration storage globally. Recent World Hydropower Outlooks reaffirm PSH as “>90% of stored energy” today and call for accelerated investment and permitting reform. [hydropower.org], [balkangree...gynews.com]

Evidence of acceleration. 2024–2025 assessments show PSH additions trending up (e.g., China’s large projects, global pipeline growth), with global PSH capacity ~179–189 GW and rising. A “Big‑100” pipeline analysis suggests a credible ramp if structural barriers are addressed—aligned with a scenario in which most suitable hilly regions adopt closed‑loop PSH. [balkangree...gynews.com], [waterpower...gazine.com]

National examples.

  • United States: DOE notes PSH accounts for ~88–95% of utility‑scale storage; FERC has established an expedited licensing track for closed‑loop PSH under 18 CFR Part 7; resource assessments indicate potential to more than double capacity. [energy.gov], [ecfr.gov]
  • India: CEA counts 4.75 GW operating, ~2.78 GW under construction, 2.35 GW DPR‑concurred, and ~52.7 GW under survey (Aug‑2023). In 2024–2025, India concurred ~7.5 GW and set targets to approve 22 GW in 2025–26; the identified PSP potential has reportedly crossed 200 GW with state policy push—illustrating what large‑scale, hilly‑region PSH mobilization looks like in practice. [cea.nic.in], [pib.gov.in], [economicti...atimes.com]

4) Economics: where PSH wins, and why the market often misses it

Cost and performance. Typical round‑trip efficiency (RTE) for modern PSH is ~75–85%; variable‑speed machines improve part‑load efficiency and regulation. Capex is site‑specific but dominated by civil works (reservoirs, tunnels) and electromechanical equipment; multi‑decade lifetimes (50–80+ years) and very low degradation make PSH competitive for 10–20+ hour applications where battery LCOS escalates. [atb.nrel.gov], [energy.gov]

Why valuations under‑reward PSH today. Many markets pay primarily for energy arbitrage, not capacity, inertia, ramping, reactive power, or black‑start. The International Forum on Pumped Storage (IFPSH) and IHA outline policy fixes—long‑term contracts for flexibility, capability payments, and clear long‑duration storage targets—to make projects bankable over 30–50 years. [hydropower.org], [hydropower.org]

Comparators. Battery turnkey costs fell sharply in 2024, but LCOS advantages fade with duration; PSH remains the lowest‑cost option for deep, long‑duration storage when amortized over life. The investment case improves further when system‑wide benefits (deferred peakers/transmission, resilience) are properly valued. [powerledger.io]

5) Environmental & social safeguards—how to do “every hilly region” right

Closed‑loop siting away from rivers is the cornerstone. It minimizes aquatic connectivity impacts, sediment, and flow regime alteration compared with traditional river‑based hydro. The ANU atlas focuses on off‑river opportunities, and international guidance (IFPSH/IHA) provides sustainability guardrails. [cell.com], [assets-glo...-files.com]

Use proven sustainability toolkits. The Hydropower Sustainability Tools (used by the World Bank and others) help standardize ESG screening, community engagement, biodiversity mitigation, and benefit‑sharing—necessary for replicable, region‑wide deployment. [documents1...ldbank.org]

Water stewardship & climate resilience. PSH recirculates water, so net consumptive use is low, mainly evaporation; however, climate change intensifies hydrological variability, so designs must plan for drought (e.g., sufficient initial fill, makeup water sources, lining to reduce seepage). Case studies show hydropower reservoirs can also aid flood control and drought management when operated as multi‑purpose assets. [ipcc.ch], [ieahydro.org]

Greenhouse‑gas considerations. Closed‑loop reservoirs with small surface area and minimal organic inflows have lower methane risk than large river impoundments; nonetheless, GHG flux assessments should be integrated into ESIA and reservoir design. (Peer reviews flag GHG from impounded waters as a planning consideration for hydropower generally.) [thetyee.ca]

6) Permitting and timelines—what has to change to avoid decade‑long sprints

Regulatory streamlining for closed‑loop. The U.S. expedited licensing for closed‑loop PSH (target ≤2 years from complete application to decision) is a template—paired with interagency task forces and standardized studies to reduce project risk without cutting corners on safety or environment. Similar pathways should be adopted elsewhere. [ecfr.gov], [law.justia.com]

Critical path items. Global analyses identify reservoir civil works, water conveyance, and interconnection as the cost/time drivers and the most material sources of construction risk; focusing innovation and standardization here (e.g., modular penstocks, mine‑pit reservoirs, brownfield pairings) can compress schedules. [energy.gov]

Digital planning and zonal pre‑screening. Many jurisdictions now run zonal environmental pre‑assessments using geospatial atlases, excluding protected areas and flagging feasible “closed‑loop zones.” This reduces site‑by‑site contention and accelerates bankability. [re100.eng.anu.edu.au]

7) Risks & mitigations at scale

RiskWhy it mattersMitigation at portfolio scale
Hydrological volatility (dReduced available water for initial fill and top‑up; higher evaporationClosed‑loop designs with small surface area; regional diversification; evaporation covers; climate‑stress testing and adaptive operating rules [ipcc.ch], [ieahydro.org]
Biodiversity & community impactsSiting conflicts can delay projects and erode social licenseEarly, transparent engagement; apply Hydropower Sustainability Tools; benefit‑sharing; avoid critical habitats; fish‑safe designs if connected [documents1...ldbank.org]
Under‑valuation in marketsRevenue stack insufficient for long‑duration projectsImplement policy frameworks for PSH: system‑wide LDES targets, capacity/flexibility remuneration, resilience credits, and long‑tenor offtakes [hydropower.org]
Permitting frictionsMulti‑agency approvals delay FIDAdopt closed‑loop fast‑track regimes similar to 18 CFR Part 7; create inter‑agency task forces; standardize ESIA scopes [ecfr.gov]
Cost overrunsCivil works uncertaintyEarly geotechnical campaigns; brownfield/“bluefield” pairings using existing reservoirs or mine pits; risk‑sharing contracts; learning‑curve procurement [energy.gov]

8) “Every hilly region” playbook—how a government (or utility) executes

  1. Map & zone: Use the ANU global atlas (and local DEMs) to identify closed‑loop, off‑river clusters outside protected/urban zones; pre‑screen for head, tunnel length, and geotechnical indicators. Publish priority zones and template technical requirements. [re100.eng.anu.edu.au]
  2. Codify value: Adopt long‑duration storage targets and capacity/flexibility products that pay for firming, inertia, and black‑start—not just arbitrage. Align with IHA/IFPSH policy frameworks. [hydropower.org]
  3. Streamline permitting: Create a closed‑loop fast track modeled on FERC Part 7—clear timelines, coordinated agency reviews, and standardized study plans. [ecfr.gov]
  4. Sustainability by design: Mandate the Hydropower Sustainability Tools for screening and ESIA, with transparent community benefit frameworks; preference mine‑pit/brownfield pairings to reduce land disturbance. [documents1...ldbank.org]
  5. De‑risk early CAPEX: Offer development grants, cost‑shared geotechnical campaigns, and availability‑based offtakes to cover long construction cycles; finance via green‑bond programs tied to resilience benefits. [hydropower.org]
  6. Plan for climate resilience: Require drought‑resilient water balances, evaporation mitigation measures, and operational roles in flood control where appropriate; integrate with basin‑level water planning. [ieahydro.org]
  7. Replicate nationally: Follow India’s example—national+state policy alignment, model DPR processes, and public dashboards—to push dozens of gigawatts from concept to FID. [pib.gov.in], [cea.nic.in]

9) Bottom line

If every hilly region with suitable topography and safeguards developed closed‑loop pumped storage, the power system would gain massive, durable, and low‑degradation long‑duration storage with grid‑forming characteristics—the exact complement to an electricity mix dominated by wind and solar. The resource exists in abundance; the decisive factors are siting discipline, sustainability, bankable revenue models, and streamlined regulation. Jurisdictions that execute on these four levers will convert hills into a quiet backbone of decarbonized, resilient electricity. [cell.com], [hydropower.org]

Endnotes & references (selected, authoritative)

Comments

Post a Comment

Popular Posts

What is P50, P52 & P90 ?

By -
P52, P53 and P90 are terms often used in the renewable energy sector, particularly in the context of wind or solar energy production analysis. These refer to statistical probability levels used in energy yield assessments to estimate the expected production of renewable projects over a certain time frame. P50 : Represents the median or "best estimate" production scenario. It means there is a 50% chance that the actual energy production will be higher or lower than this value. It is the expected average production in a typical year. P52 or P53 : These are uncommon notations, but they might represent slight variations from the median estimate, with a slightly higher probability of occurrence than P50. P90 : This represents a conservative estimate, meaning there's a 90% chance that the actual production will be equal to or exceed this value, making it suitable for financial risk assessments. In summary, P-levels like P50, P52, or P90 provide different confidence levels for ...
Read more

GHG accounting and its emission factors

By -
Greenhouse Gas (GHG) Accounting involves quantifying emissions across different scopes (Scope 1, Scope 2, and Scope 3) and is typically guided by protocols such as the Greenhouse Gas Protocol. Here are the key formulas and approaches used in GHG accounting for each scope: 1. Scope 1: Direct Emissions Scope 1 includes direct emissions from sources owned or controlled by the organization (e.g., fuel combustion in company-owned vehicles, emissions from manufacturing processes). Formula for Combustion Emissions For fossil fuel combustion: Emissions = Activity Data × Emission Factor \text{Emissions} = \text{Activity Data} \times \text{Emission Factor} Emissions = Activity Data × Emission Factor Activity Data : Quantity of fuel used (e.g., liters of diesel, cubic meters of natural gas). Emission Factor : A coefficient that represents the emissions produced per unit of activity (e.g., kg CO₂ per liter of diesel). Example (CO₂ emissions from fuel): CO₂ Emissions = Fuel...
Read more

Deviation Settlement Mechanism (DSM) guidelines 2024

By -
As per the latest Deviation Settlement Mechanism (DSM) guidelines from the Central Electricity Regulatory Commission (CERC), DSM charges are defined based on grid stability needs, particularly regarding frequency deviation and renewable energy dynamics. The charges vary depending on the deviation percentage from the target frequency range (49.90 Hz to 50.05 Hz), with penalties scaling for larger deviations. For renewable-rich and super renewable-rich states (based on their installed wind and solar capacity), CERC allows greater flexibility in permissible deviation limits on the demand side. This aims to balance the grid challenges posed by variable renewable generation. States with renewable capacities between 1 GW and 5 GW are considered renewable-rich, while those with over 5 GW are super renewable-rich. Stand-alone energy storage systems (ESS) are subject to similar DSM charges as general sellers, but ESS paired with renewables like wind and solar follow specific volume limits for o...
Read more

BESS Tenders for Grid-Scale Energy Storage Adoption in India

By -
Introduction India’s energy landscape is undergoing a transformative shift. With over 50% of its installed power capacity now coming from non-fossil fuel sources—five years ahead of its 2030 target—the country is rapidly embracing renewable energy. However, the intermittent nature of solar and wind power presents significant challenges to grid reliability and energy dispatch. Battery Energy Storage Systems (BESS) have emerged as a critical solution to these challenges, and government-led tenders are playing a pivotal role in accelerating their adoption. Why Grid-Scale Energy Storage Is Essential India’s peak power demand surpassed 250 GW in 2024 and continues to rise. To maintain grid stability while integrating increasing volumes of renewable energy, robust energy storage solutions are essential. BESS enables: Load balancing  during peak and off-peak hours Frequency regulation  and grid stability Renewable energy dispatchability , ensuring power a...
Read more

Why the dislike button is removed in all the social media platforms?

By -
 The removal or absence of a dislike button on most social media platforms can be attributed to several reasons, primarily centered around user experience, mental health, and the dynamics of online interactions. Here's a detailed explanation: 1. Preventing Negativity and Harassment A dislike button could encourage negative behaviors, such as trolling or bullying. Users might use it to target individuals or content creators, leading to a toxic environment. Platforms aim to promote constructive engagement rather than actions that might demoralize users. 2. Mental Health Concerns Social media companies are increasingly aware of the impact their platforms have on mental health. Visible indicators of disapproval could harm users' self-esteem and lead to stress or anxiety, especially for younger or vulnerable audiences. 3. Focus on Constructive Feedback Platforms encourage users to give feedback in a constructive manner, such as through comments or reporting inappropriate content. A...
Read more