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What California is learning from solar panels built over irrigation canals

372 points · 744 comments · Jtsummers

  1. nbf_1995 · · focus · HN ↗
    It seems like it would be more effective to simply put all the solar panels in a field, and construct a cheap shade over the entire canal no? The supports in the picture are massive and don't look cheap. Also I would imagine the solar array uses more copper than a similar capacity array just built in a field. You can't daisy chain multiple miles of solar panels together, so you need an extra power line to run alongside the whole thing.

    Put the solar panels in a field: The solar array uses less copper. The shade supports don't have to hold up solar panels: Shade supports cost less.

    The best reasoning they give is that California has insane permitting requirements, and it takes 1/6 the time to build on developed land compared to undeveloped land.

    1. schnevets · · focus · HN ↗
      Anecdotally speaking, I have heard of a massive California solar farm in an undeveloped area that has serious vandalism problems. Junkies will find ways through the fencing at night, strip copper and other materials from panels, and cause thousands in damages and lost energy just to extract enough scrap for a fix.

      Nothing short of a face-to-face security response will deter these criminals, so there it is a challenging cost-benefit balance. At least panels in parking lots and other developed spaces have the benefit of witnesses. I'm sure a 20 foot climb up a steel beam over running water is a decent deterrent as well.

      1. swiftcoder · · focus · HN ↗
        > Junkies will find ways through the fencing at night, strip copper and other materials from panels, and cause thousands in damages and lost energy just to extract enough scrap for a fix

        I live in a European country, where the phone company hasn't bothered to come remove the old unused copper phone lines in the last 5 years. Thousands of dollars worth of cables running past my house alone, and no one has bothered to go strip it in the night and sell it

        This feels like one of those USA problems that would be better addressed by funding decent social services (free healthcare, cheap housing, addiction treatment programs, etc).

        1. keiferski · · focus · HN ↗
          America is an entirely different cultural universe and simple things like this seem logical but just wouldn’t really solve the entire problem, IMO, as an American that’s lived in Europe for a decade+.

          Another great example are the “open air” transit systems in Germany, Poland, etc. where you can freely enter trams and buses, with inspectors patrolling infrequently to check if you bought a ticket. That kind of system would absolutely never work in America, no one would pay, and the ticket inspectors would be hated as some kind of secret police.

          1. swiftcoder · · focus · HN ↗
            > Another great example are the “open air” transit systems in Germany, Poland, etc. where you can freely enter trams and buses, with inspectors patrolling infrequently to check if you bought a ticket. That kind of system would absolutely never work in America

            This is exactly how Seattle's light rail worked for years. You could just walk on and off, and I saw an inspector maybe 1-in-10 trips at best

            1. keiferski · · focus · HN ↗
              Interesting, I’ve never been to Seattle. But it looks like they are adding fare gates, so apparently it isn’t working.
              1. swiftcoder · · focus · HN ↗
                Yeah, the system was tiny originally - just a single line from the airport to downtown. I left right before the big system expansion started, I wouldn't be surprised if scale has exposed more issues with the system
                1. Gh0stRAT · · focus · HN ↗
                  From what I've heard, fare compliance used to be relatively high but dropped massively (alongside ridership) during COVID and hasn't really recovered.
                  1. buildsjets · · focus · HN ↗
                    Of course ridership dropped during COVID, but it very quickly recovered and is now well over double the ridership before the COVID dip. Also note that prior to COVID, the system was still under construction and not even the 1 Line was fully operational yet. It could take you from UW to the Airport, and that's about it, the complete 1 Line route to Northgate did not open until October 2021, Lynnwood to downtown extension did not open until 2024, and Line 2 from Redmond to downtown did not open until earlier this year.

                    So, it's hard to make a direct comparison of fare compliance before and after the "COVID times" however you define the time period, as the are very different transit systems that now serve a different geographical area and population. But fare compliance has recovered from 56% during the peak of COVID to 63% in 2025, and 2026 numbers are not out yet.

                    <a href="https:&#x2F;&#x2F;www.seattletimes.com&#x2F;seattle-news&#x2F;transportation&#x2F;seattles-daily-light-rail-ridership-jumps-to-no-1-in-u-s&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.seattletimes.com&#x2F;seattle-news&#x2F;transportation&#x2F;sea...

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