Closed-Loop Pumped Hydroelectric Storage

Pumped Hydro Development
for the Clean Energy
Transition.

GravityGrid identifies, scores, and develops optimal sites for pumped hydroelectric storage — the only proven long-duration energy storage technology capable of keeping the grid reliable through the renewable buildout.

Work With Us
80
validated PSH sites across the US — screened & ground-truthed
30
states with identified high-potential sites
50%
ITC eligible — energy community & coal-exit zones
2yr
expedited FERC licensing for closed-loop projects (§ 2403)
Why PSH

A 100-year asset that the grid has always run on.

100+ yrs
Asset Life
A FERC license grants 40-year operating terms, renewable for the life of the dam structure. No degradation curves, no battery cycle limits. Infrastructure that appreciates as grid demand grows.
~$1,800/kW
Installed Cost
Competitive with grid-scale battery storage at the MW scale, with a fraction of the operating cost and zero fuel input. The cost/kWh at 10+ hours of storage duration is unmatched.
Zero
Rare Earth Minerals
Water, concrete, and gravity. No lithium, no cobalt, no supply chain exposure to critical mineral markets. Closed-loop design eliminates river permitting and ecosystem disruption.
8–12+ hrs
Storage Duration
The only proven long-duration storage technology deployed at commercial scale. Battery systems top out at 4–6 hours economically. PSH delivers the overnight and multi-day storage that grid operators actually need.
Why Utilities Need This NOW

Data centers changed the math. Utilities need dispatchable storage at scale.

The US power grid faces a demand surge it hasn't seen in decades — driven by AI infrastructure, electrification, and reshoring. Renewables are the fastest new supply. But wind and solar can't dispatch on demand. PSH is the missing piece.

→
🏗️
Data Center Explosion
US data center power demand is projected to grow from ~17 GW today to 35–50 GW by 2030. AI training clusters alone consume hundreds of MW per facility.
+100% demand by 2030
→
☀️
Renewables Are the Supply
Solar and wind are the fastest and cheapest new generation to build. But they're intermittent — production peaks don't match load peaks. The grid runs on supply/demand balance, second by second.
Fastest new supply
→
⚡
Intermittency Problem
Adding more wind and solar without storage creates volatility: oversupply crashes prices in the middle of the day, undersupply spikes prices at night. Grid reliability requires dispatchable backup for every MW of intermittent generation added.
Every MW needs backup
💧
PSH is the Answer
Pumped hydro stores surplus renewable energy as water elevation and dispatches it on demand — at the scale, duration, and reliability that grid operators require. No other technology does all three.
Only proven solution
The Strategic Case

Utilities that move now on PSH development lock in long-duration storage capacity before the supply crunch hits. A closed-loop PSH project takes roughly 5 years from site identification to shovel-ready — versus 12–18 years for traditional permitted hydro. The window to identify and permit sites ahead of peak demand is open. It won't stay open.

Our Approach

From terrain to investment-ready project.

01 / Screen

GIS Site Identification

Automated topographic screening across elevation differentials, water availability, geology, and land access — followed by ground-truth validation against 3DEP elevation, PAD-US protected areas, HIFLD transmission, and NHD hydrology data. 80 validated sites across 30 states.

02 / Score

Market & Grid Fit

Proximity to transmission, grid congestion zones, retiring baseload plants, and state storage mandates. Sites are scored 0–10 on composite technical and economic factors.

03 / Permit

Expedited FERC Pipeline

Closed-loop PSH qualifies for § 2403 expedited licensing — 2-year FERC licensing vs the traditional decade-plus timeline. FERC Preliminary Permit → FERC License → Operating License.

04 / Partner

Utility Partnership Model

We target reclaimed mine lands and post-industrial sites — lower land acquisition cost, community support, and coal-exit ITC eligibility. We structure partnerships with regional utilities and IPPs from day one.

Get in Touch

Let's find your next long-duration storage asset.

Whether you're a utility planning your long-duration storage strategy, an IPP looking for shovel-ready PSH projects, or an infrastructure investor evaluating the space — we want to hear from you.

gravitygrid@polsia.app
Response within 24 hours
Thank you — we will reach out as soon as possible.