Water-rich Switzerland controls Western Europe’s taps — and wants it to stay that way. Its drought-ridden neighbors are getting nervous.

Water-rich Switzerland controls Western Europe’s taps — and wants it to stay that way. Its drought-ridden neighbors are getting nervous.

At the western edge of Lake Geneva, where the mighty Rhône river squeezes through a narrow dam, a blunder of French diplomacy is carved into stone for all to see.

The inscription, mounted on the walls of an old industrial building, commemorates the 1884 accord between three Swiss cantons that have regulated the water levels of this vast Alpine lake ever since. It does not mention France — even though some 40 percent of the lake is French territory.

“France, for some reason, wasn’t part of the contract,” said Jérôme Barras as he unlocked a gate below the epigraph to inspect a hydropower plant under the dam he has managed for more than a decade.

When the agreement was renewed and a new dam was built a century later, Paris still wasn’t interested.

The French government now regrets that.

…

And France has suddenly realized it can’t control that tap as it battles water shortages, destructive droughts and baking heat.

  • tal@lemmy.todayEnglish
    5·
    6 months ago

    Some places use the waste heat for district heating, in which case the waste heat isn’t really a waste any more. I don’t know if France does that, though. The Soviet Union was super-big on district heating. That won’t consume all of the heat, and it really just gets you cheap heating for the city – like, a large power plant will generate more heat than you actually need to heat a city.

    In the US, we historically had some very limited district heating, though that was driven off waste heat from fossil fuel power plants, where you can do the same thing.

    If you can make use of the heat output directly, it’s an area where thermal options (fossil fuels, nuclear, geothermal, solar thermal) compare particularly favorably to non-thermal options (solar panels, wind, hydroelectric), because there the thermal options don’t need to see the efficiency reduction from conversion to electricity and back.

    googles

    Sounds like they aren’t currently using the heat for district heating (or at least some aren’t), so they could probably use at least some of the heat some of the time for that.

    https://www.sciencedirect.com/science/article/abs/pii/S0301421518300533

    While being source of low carbon electricity, French nuclear plants also produce excess heat currently rejected to the surrounding environment. This heat represents approximately two thirds of the total energy generated (Safa, 2012). The whole French nuclear fleet and most nuclear reactors operating today in the world (277 out of 438) and tomorrow (59 out of 70 under construction; IAEA, 2015) are Pressurized Water Reactors (PWR). Similarly to cogeneration plants based on fossil fuels or biomass, PWR can be designed to produce both electricity and heat without affecting the reactor’s safety (STUK, 2009: p. 6). Doing so would involve reducing the amount of heat which is converted to electricity (Carnot efficiency). For the temperatures useful to conventional 3rd generation DH networks (80–120 °C), the thermal energy recovered is six times higher than the electricity losses (Safa, 2012). Production of heat for DH application has been experienced with at least 51 nuclear combined heat and power plant (NCHP; Leurent et al., 2017), hence providing valuable feedbacks for optimizing such energy systems.

    That being said, the time when anyone cares about water flows and river temperatures is presumably the summer, and that’s also going to be when there’s less demand for heat. So it’s more a way to get heating more-efficiently than an alternative to dumping heat somewhere.

    Unless you’re gonna create some absolutely colossal thermal energy store that could span seasons, like, put a cover on a lake, heat it up in the summer, and then use that heat in the winter.

    • grue@lemmy.worldEnglish
      3·
      6 months ago

      The other issue is that in order to provide district heating you’ve got to put your power plant next to a city instead of in the middle of nowhere, like we prefer to do in the US (especially for nuclear).

      • tal@lemmy.todayEnglish
        3·
        6 months ago

        I think for the US, the structure of the city is also a factor.

        This is painting with a broad brush, but:

        American cities tend to have a very high-density core that has offices and stores and such, and are surrounded by a lot of low-density housing.

        European cities tend to have a medium-density, about four stories, across the city.

        That’s a function of the fact that a lot of the US was constructed after the invention of the elevator (which allows for taller building heights to be practical; historically, top floors were undesirable) and the automobile (which allows for lower-density housing to be practical). There are few skyscrapers in Europe; Turkey actually has the most, by a huge margin, and like the US, Turkey saw a lot of population growth in the 20th century, so a lot of Turkey is gonna be new-build.

        I spent a while looking at the few US district heating systems that existed in the past (and a few, now). They don’t do the suburbs – they provided heating to that high-density city core. There, they don’t have to run pipes a long distance to transport heat; electricity is cheaper to transport than heat.

        There are exceptions that do provide district heating to residences, like Manhattan, but Manhattan is also a (partial) exception to the “high-density core, low-density suburbs” structure; New York City, though the largest American city, doesn’t look much like a typical American city:

        https://en.wikipedia.org/wiki/New_York_City_steam_system

        https://streeteasy.com/blog/steam-heat-in-new-york-city-explainer/

        New York’s first steam system was installed in 1881 in response to a need for an underground system immune to the elements. Now, New York has over 105 miles of steam piping serving nearly 2,000 buildings — it’s the largest steam system in the world, by a massive margin.

        But for the general case, I expect that it’s gonna make less economic sense to do district heating of housing in the US than in Europe.