Solar panels bolted over 2 working irrigation canals in California's Central Valley cut evaporation beneath them by as much as 70 percent, and the aquatic weed that fouls those channels dropped by about 85 percent

Sep 16, 2026 8:33 PM

Apeofdeath

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https://www.reddit.com/r/solarpunk/s/l8v1W17tmh

ecoportal.net

California's Project Nexus bolted solar arrays over 1,400 feet of irrigation canals in Stanislaus County and measured a 70% drop in evaporation and an 85%

california

canal

farming

solar

See, that's another useful use for trees

5 days ago | Likes 1 Dislikes 0

The aquatic weed thing is a nice bonus but I would have just assumed that shade would help anyway. I always just assumed that the corpos just didn't want to embrace solutions that would lose them money.

5 days ago | Likes 1 Dislikes 0

I look forward to us gradually rolling out another 3 miles of test canal over the next 76 years.

5 days ago | Likes 2 Dislikes 0

We could've been doing this ages ago, but some moron said "solar roads!"

5 days ago | Likes 3 Dislikes 2

Is it 85% of a sentence?

5 days ago | Likes 72 Dislikes 2

5 days ago | Likes 26 Dislikes 1

But now you're ruining the environment with solar panels. Won't that kill whales or something?

5 days ago | Likes 1 Dislikes 0

Funny how putting shade over an area drops the temperature a bit. It's almost like people haven't been sitting under trees for shade to cool down for... forever. I feel like the technology of putting a roof over something has been around for millennia and yet NOW they think of this to save water from evaporation? Not knocking the tech, but come on science-bros... This seems long overdue and a very basic approach to me.

5 days ago | Likes 2 Dislikes 1

If only Nevada would do that along infinitely long stretches of desert highway...

5 days ago | Likes 1 Dislikes 0

*Correction :- "Fouls" means naturally growing in water in this location.

5 days ago | Likes 1 Dislikes 0

It could have saved the reflecting pool!

5 days ago | Likes 6 Dislikes 0

https://search.brave.com/images?q=solar+panels+for+livestoazing">https://search.brave.com/imck+gr">azing">https://search.brave.com/images?q=solar+panels+for+livestock+grazing
https://search.brave.com/images?q=shade+grown+crops+und">ages?">ck+gr">azing">https://search.brave.com/images?q=solar+panels+for+livestock+grazing
https://search.brave.com/images?q=shade+grown+crops+under+solar+panels
https://solargrazing.org/what-is-solar-grazing
https://www.asce.org/publications-and-news/civil-engineering-source/article/2026/03/02/agrivoltaics-how-combining-solar-panels-and-farming-delivers-big-benefits

5 days ago | Likes 2 Dislikes 1

need a few hundred miles!

2 days ago | Likes 1 Dislikes 0

Say "Bolted" again.

5 days ago | Likes 1 Dislikes 0

Aquatic weed? That hydroponic shit will get you fucked up.

5 days ago | Likes 1 Dislikes 0

This is a great photo. You could make a meme that people would share on social media.

5 days ago | Likes 1 Dislikes 0

Good news, I like it

5 days ago | Likes 1 Dislikes 0

And there's 5K mi of canals there.

5 days ago | Likes 1 Dislikes 0

85% ..

5 days ago | Likes 5 Dislikes 0

I wish they'd do this for parking lots and roads/highways.

5 days ago | Likes 16 Dislikes 0

Over roads and they need to be a bit too tall, it's expensive. But build bicycle/walking streets with them above...

5 days ago | Likes 1 Dislikes 0

I'm in Northern California, and lots of office building now have solar-covered parking lots; roughly 40% of the parking lot at my office is covered with solar panels.

5 days ago | Likes 14 Dislikes 0

At high schools, hospitals and colleges too.

5 days ago | Likes 1 Dislikes 0

Emission creates a lot of dust/dirt

5 days ago | Likes 2 Dislikes 1

The way America's going i fully expect someone to just drag a chain over the entire thing with some jig on their truck "because woke".

5 days ago | Likes 1 Dislikes 0

Pipe. Walking trail. Then solar panels

5 days ago | Likes 1 Dislikes 0

Solarpunk is so awesome, thats the way we need to be going

5 days ago | Likes 2 Dislikes 0

kinda ironic that a site that seems to be focused on positive stories about the environment uses ai generated images for every article

5 days ago | Likes 102 Dislikes 8

Who the fuck has energy to look at every single fucking image to look up if it's AI or not.

3 days ago | Likes 1 Dislikes 0

Jesus that's lazy

5 days ago | Likes 6 Dislikes 0

Yeah, every shadow is just not right

5 days ago | Likes 5 Dislikes 1

Hope you did your part

5 days ago | Likes 8 Dislikes 1

Fuck man there is rust all over in that AI pic

5 days ago | Likes 8 Dislikes 0

He should prompt the AI next time to make the image not such a grotesquely misuse of concrete and steel, over-building the structure. Get a real engineer, man.

5 days ago | Likes 8 Dislikes 4

He should ask it how not to be a neolib.

5 days ago | Likes 1 Dislikes 3

You can just glance at a structure and determine the dead load, wind load, and seismic resistance accurately enough to state definitively that the selected steel section is "grotesquely" over built? Do you see the fence in the background? That is likely 6' high for an idea of the scale of the structure. Hopefully you're not an engineer irl, and instead just another loud mouth ignoramus on the internet.

5 days ago | Likes 4 Dislikes 1

I think it's also a completed section of one of the 15ft wide canals.

5 days ago | Likes 1 Dislikes 1

I took one look at the weird "weeds" and how they just exactly stop at the edge and said "there's some AI bullshit

5 days ago | Likes 1 Dislikes 0

Oh wow, cover the water and it keeps better. Who'd have thunk it?

5 days ago | Likes 2 Dislikes 0

Also, downvote for AI use. I know it's the news site that did it but still, it's principle.

5 days ago | Likes 1 Dislikes 1

Why not just cover the canal with like boards or something for the evaporation/algae thing? I mean solar panels work too, definitely a better idea than making solar roads like some geniuses proposed some time ago, but come on…

5 days ago | Likes 5 Dislikes 0

cause they want more power as well.

5 days ago | Likes 2 Dislikes 1

Yes but setting up regular solar panels in a field nearby; then separately putting wooden boards over the canal, would be cheaper to build and (significantly) cheaper to maintain, than combining both projects into solar panels over canal. Unless you’re extremely constrained by land, seems the extra costs seem to outweigh the benefits of this project over two much simpler and routine projects unrelated to one another.

5 days ago | Likes 4 Dislikes 0

Downstream water users have no leverage to get upstream users to do this.

5 days ago | Likes 4 Dislikes 0

If you want to cut evaporation, just put a roof over the canal. Having wired solar panels like over a whole canal would be a maintenance and logistical nightmare, especially for canals that may be hundreds of miles in length. It would be more efficient to have panels over parking lots in cities, since parking already takes up half the space in the city, the electrical infrastructure is already there, and repairs could be done on a local basis.

5 days ago | Likes 9 Dislikes 6

Evaporation provide cooling to the panels, makes them function better.

5 days ago | Likes 1 Dislikes 5

there are more efficient ways to cut evaporation and to generate power, but how does the cost/benefit of doing 2 more efficient projects compare to doing each less efficiently in 1 project? that's an honest question because i absolutely don't have the numbers. but e.g. if it is 85% as effective, but costs 75% the combined price, that's still a net win. on the other hand if its only about 50% as effective for 100% of the combined price, then you'd be better off just doing them separate

5 days ago | Likes 6 Dislikes 1

If you're already constructing a very solar panel friendly roof, in 2026, you might as well put a solar panel on it. Really, no downside.

5 days ago | Likes 1 Dislikes 0

You should look up solar carports bud.

5 days ago | Likes 2 Dislikes 0

Dope. I'm here for this. Progressive!

5 days ago | Likes 286 Dislikes 2

Progressively generated by AI. There is rust in the dirt and concrete and that rake is huge

5 days ago | Likes 2 Dislikes 0

Repubs are already against it then!

5 days ago | Likes 9 Dislikes 0

THOSE ARE HARDWORKING WHITE AMERICAN AQUATIC WEEDS AAAAHHHHHH

5 days ago | Likes 4 Dislikes 0

"Nobody knows more about energy than me—nobody. Solar is a total scam! When a cloud comes over, the power goes completely out—your TV turns off, your fridge stops! And those panels actually drain the natural light right out of the sun, killing millions of birds. Terrible!" /s

5 days ago | Likes 3 Dislikes 0

I still don't know why in southern states they don't try this in parking lots. Imaging a Costco in California and half the lot was always in the shade. The power made could offset the power for the building. If it works then you could do the full lot, but, I know, it's pricy.

5 days ago | Likes 3 Dislikes 0

No, it's a different kind of 'weed', but I agree with the sentiment

5 days ago | Likes 6 Dislikes 0

this has been a common implementation over canals for the past two decades btw, much of the newest solar is these solar shades for canals.

5 days ago | Likes 34 Dislikes 4

Lots of canals in Phoenix could utilize this system most have trails that follow them, fish and local plant life. And all that power going back into the grid?! What's the hold up, folks?!

5 days ago | Likes 6 Dislikes 0

…. It doesn’t enrich the republicans?

5 days ago | Likes 6 Dislikes 0

We just need to start implementing something similar for the fuckoff huge swaths of parking we have in the US. I'd imagine your average Walmart parking lot would be viable enough to provide power for the store and for most of the surrounding homes and whatnot. Plus it would be shielding from the sun and rain for people and vehicles. Win-win

5 days ago | Likes 20 Dislikes 0

Yes! This please

5 days ago | Likes 6 Dislikes 0

Yes. Stop wasting farm lands or rural areas for solar farms. Incentives for solar on parking lots and commercial building roofs.

5 days ago | Likes 1 Dislikes 0

That's what's power is needed anyways. Every Walmart would be able to power the homes of every shopper

5 days ago | Likes 1 Dislikes 0

1,400 feet ≈ 427 metres

5 days ago | Likes 9 Dislikes 2

It's like 1/4 mile. How short is the canal?

5 days ago | Likes 2 Dislikes 1

How many bananas is that though?

5 days ago | Likes 2 Dislikes 1

42

5 days ago | Likes 1 Dislikes 2

2542 bananas OR 4200 hamburgers OR 2800 hot dogs

5 days ago | Likes 1 Dislikes 2

I'm just surprised some startup hasn't suggested putting solar panels on the canal bottom, like they keep doing with roadways and train tracks.

5 days ago | Likes 20 Dislikes 2

Only if they are attached to a unwanted traffic cam. Still not recommended though.

5 days ago | Likes 1 Dislikes 1

Solar panels on roads, tested in France and it doesn't work. Like at all,

5 days ago | Likes 4 Dislikes 0

5 days ago | Likes 15 Dislikes 0

I mean, we have a lot of roadway in the US. If we could convert some of that into energy production, it'd be amazing. Issue is that none of the proposed methods ao far have been at all viable. Turns out that driving several tons of steel and glass over a solar panel isn't great for the panels longevity, and that cars kind of need a surface that's not smooth plastic to drive on, unless you're planning on driving out of control.

5 days ago | Likes 7 Dislikes 1

Yeah maybe things putting solar panels in the empty area around highway rest areas? One not too far from where I live has about 10 acres of flat, open space in the empty area between the freeway and and rest area parking lot, plus an additional 2 acres or so if they put solar panel shade awnings over the parking lot areas.

It's space owned by the city or state already, unusable for anything else, and could power the rest area itself + a couple hundred nearby homes easily.

5 days ago | Likes 4 Dislikes 0

Solar.. Fucking.. Roadways. Jesus buttfucking Christ, was that ever a fucking stupid idea.

5 days ago | Likes 9 Dislikes 1

Well they are starting to use graphene to enhance solar panel efficiency and it has a self cleaning effect too. But if they were to also use graphene for structural reinforcement. They might be able to make panels strong enough to drive heavy equipment on.

5 days ago | Likes 3 Dislikes 2

Not if you use bifacial panels. Then it makes twice as much sense

5 days ago | Likes 6 Dislikes 0

5 days ago | Likes 5 Dislikes 0