Connect with us

Hi, what are you looking for?


Energy Storage

US Pumped Hydro Potential

Reposted from Arctic Sea Ice Forum (with minor edits):

At this point in time, pump-up hydro is our cheapest way to store electricity. Pump water up with spare electricity, let it flow back through turbines when we need electricity.

We’ve got over 20 GW of pump-up hydro in the US that we installed back when we were building nuclear reactors. There’s no way to turn them off when we don’t need the power, so we built pump-up to carry late-night surplus power to daytime peak hours.

It’s not uncommon for people to claim that there are no more places to build pump-up hydro. They usually claim the tree huggers wouldn’t allow it. (And, lots of us would object to damming any more streams.)

But how about converting some existing dams to pump-up. Might there be a couple we could use?

pumped hydro USThere’s a 1997 study of existing dams on federal land [PDF]. The researchers were interested in seeing if any were potential power producers. They looked at 871 existing dams and screened them for adequate hydraulic head (enough pressure to run a turbine), stream inflow, reasonable distance from transmission lines, outside of protected areas, etc. They found that 6 had hydro generation potential, that together they could produce 1,230 MW — enough power for 957,000 residences.

Luckily they posted a list of all 871 dams in the appendix, along with dam height/head.

I worked my way through the first 212. Out of that 212 sample, 29% (61) had at least 50′ of head, 9% (19) had at least 100′ of head, and 4% (eight) had at least 190′ of head.

In the US, we’ve got around 80,000 existing dams. We use about 2,500 currently to produce electricity. That leaves us with approximately 77,500 candidate existing dams.

Using the federal dam percentages, we might expect 22,475 with greater than 50′ of head, 6,975 with greater than 100′ of head, and 3,100 with greater than 190′ of head.

Potentially thousands of existing dams usable for pump-up storage.

Almost all dams (every dam I’ve ever visited) has a set-aside safety zone below it.

  1. Go a short distance from the dam and excavate a “2 to 5 day hole,” a large enough basin to hold the water that would be used for generation over the longest period in which the wind and sun let us down.
  2. Install a pump/turbine combo between the two reservoirs.
  3. Run wire.
Appreciate CleanTechnica’s originality and cleantech news coverage? Consider becoming a CleanTechnica Member, Supporter, Technician, or Ambassador — or a patron on Patreon.

Don't want to miss a cleantech story? Sign up for daily news updates from CleanTechnica on email. Or follow us on Google News!

Have a tip for CleanTechnica, want to advertise, or want to suggest a guest for our CleanTech Talk podcast? Contact us here.
Written By

We publish a number of guest posts from experts in a large variety of fields. This is our contributor account for those special people, organizations, agencies, and companies.


#1 most loved electric vehicle, solar energy, and battery news & analysis site in the world.


Support our work today!

Power CleanTechnica: $3/Month

Tesla News Solar News EV News Data Reports




Tesla News

EV Reviews

Home Efficiency

You May Also Like

Clean Power

Missouri and Illinois are hatching plans for a new industrial hub with a green hydrogen angle, but Missouri's "trigger law" could throw a monkey...

Clean Power

Virginia is going from near-zero wind power to 2.6 gigawatts all at once, with the approval of a new offshore wind plan for Dominion...


The power of the renewable energy lobby in Arizona will be tested as the US Senate (finally) votes on the Inflation Reduction Act of...

Clean Power

The Energy Department is planning on 100% renewable energy now, Inflation Reduction Act or not.

Copyright © 2021 CleanTechnica. The content produced by this site is for entertainment purposes only. Opinions and comments published on this site may not be sanctioned by and do not necessarily represent the views of CleanTechnica, its owners, sponsors, affiliates, or subsidiaries.