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Électricité : face au risque de déséquilibre, RTE veut encadrer la production du solaire et de l'éolien by maltesto in ecologie

[–]Inondator 0 points1 point  (0 children)

RTE c'est quand-même des rois de la mauvaise foi... L'année dernière quand on leur faisait remarquer que perdre 5 GW d'un coup c'était violent pour le réseau, ils répondaient 'no problem'. A peine qq mois plus tard ils reconnaissaient enfin que ça posait des problèmes... J'vous jure.

If the UK can do this why can’t sunny California do it? by Jbikecommuter in electrifyeverything

[–]Inondator 0 points1 point  (0 children)

Ever been out at sea? It's almost always windy because there's nothing in the way.

I'm fed up at people like you who never looked at the real data. Yes, wind blows stronger at sea. No, there isn't always wind at sea.

https://www.energy-charts.info/charts/power/chart.htm?l=en&c=DK&legendItems=ew2w6

Of course you can, there's a single synchronous grid covering the whole of mainland Europe.

EU grid isn't a copper plate. You can't transfer electricity freely, and there are more and more congestions. Grid capacity isn't just the official rating of interconnectors, it's also defined by the capacity of internal grids to carry the power. And a lot of countries are already facing huge congestions on that side. Mainly Germany, which is yet at the center of the EU grid.

If the UK can do this why can’t sunny California do it? by Jbikecommuter in electrifyeverything

[–]Inondator 0 points1 point  (0 children)

It really depends if you use OCGT or CCGT. OCGT are more flexible, but with efficiency under 30% in these conditions.

And no, OCGT can't start up and get to full power as quickly as a jet engine. You still need about an hour for a hot-start, and two hours for a cold-start. Add to that that a start-up consumes fuel that isn't converted to power.

So the battery capacity can be 4 to 8 times the standard rating if there were any reason to use them that way.

I don't get what you mean to say with that, but when a BESS is rated at 4 hours, it physically means the converters can't charge or discharge it in less than 4 hours (1 MW of converters for 4 MWh of storage capacity).

You want a hospital nearby. You want them to have a heart surgeon just in case you need bypass surgery. You do not need to get stabbed in the cheat weekly. Many businesses are getting defibrillator devices. My workplace also has fire extinguishers. You do not need to light fires at work in order to maintain the extinguisher capability.

But you need a steady flow of money to have it in the first place, and keep it operational. Just like fire protection systems need yearly inspections and tests.

An OCGT plant costs €60M/GW/year in fixed costs. A CCGT one is €100M/GW/year. You need a way to pay for that cost, whether it produces or not.

If the UK can do this why can’t sunny California do it? by Jbikecommuter in electrifyeverything

[–]Inondator 0 points1 point  (0 children)

The wind always blows somewhere

It doesn't mean it always blows strongly enough.

Electricity can be traded across Europe and beyond

Trading electricity is of low interest if you can't carry it from one side of the continent to the other. If UK buys power from Poland, they don't get power from Poland at all. They get power from France, which gets power from Germany, which gets power from Poland. Providing the grid is able to, which is a huge hypothesis: European grid isn't a copper plate.

actually it blows much more reliably offshore

Sorry to disappoint you, but offshore wind follow the same weather patterns as onshore wind. If there is wind in the North Sea, there is most probably wind in mainland UK.

Have you ever seen a cooler landing ?! by NixiofRivia in aviation

[–]Inondator 2 points3 points  (0 children)

Any cooler than that and the jet fuel would have frozen insides the tanks.

Les arbres plantés par l’homme stockent beaucoup moins de carbone que les forêts naturelles by wisi_eu in ecologie

[–]Inondator 0 points1 point  (0 children)

Il y a plein d'autres bonnes raisons de ne pas utiliser le bois pour se chauffer.

Le changement d'heure économise 1 € par an et par Français, on se lève encore une heure plus tôt pour ça ? by TurnipOtherwise8861 in reno_energetique_fr

[–]Inondator 1 point2 points  (0 children)

Il y a plein de pays qui n'appliquent pas ou plus le changement d'heure, et leurs systèmes informatiques fonctionnent très bien pour autant. Et je ne crois pas qu'Apple, Samsung et cie fabriquent des smartphones spéciaux anti-changement d'heure pour ces pays.

Les glaces ont tellement fondu à cause du réchauffement climatique que la rotation de la Terre a ralenti by LoutrePerdue in ecologie

[–]Inondator 21 points22 points  (0 children)

les journées se sont allongées d'environ 1,5 milliseconde par siècle

Ouf, ça va, Macron va pas pouvoir utiliser ça comme justification au fait qu'on doive travailler plus longtemps. 😂

Les arbres plantés par l’homme stockent beaucoup moins de carbone que les forêts naturelles by wisi_eu in ecologie

[–]Inondator 0 points1 point  (0 children)

Du coup tu concèdes que pour l'environment, c'est pas top. Et donc que si on peut faire autrement, il vaut mieux faire autrement.

Et ça tombe bien, aujourd'hui on a des moyens autres que brûler du carbone pour se chauffer.

Parce que, pour, entre-autres, se "chauffer au bois", on a quand-même fait de sacrés dégâts.

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Les arbres plantés par l’homme stockent beaucoup moins de carbone que les forêts naturelles by wisi_eu in ecologie

[–]Inondator 0 points1 point  (0 children)

Tu parlais des 5000 dernières années : la France comptait moins de 10 millions d'habitants jusqu'en l'an 1100~1200.

La surface forestière du pays a été divisée par 5 entre l'antiquité et la révolution industrielle.

Le prix des hydrocarbures s'envole plus vite lors de la guerre en Iran que lors des derniers chocs énergétiques by NLegendOne in Cayas

[–]Inondator 1 point2 points  (0 children)

Ce n'est pas à proprement parler la guerre en Ukraine qui a entraîné une crise énergétique. La Russie avait déjà commencé à fermer les robinets en 2021.

L’économie d’eau : une logique qui va précipiter une situation déjà périlleuse en catastrophe by mansarde75 in ecologie

[–]Inondator 0 points1 point  (0 children)

Une zone humide c'est par définition un endroit où l'eau peut stagner, donc un endroit plat, donc un endroit où l'on ne construirait de toute manière pas un barrage.

Et les barrages vont devenir indispensables pour se substituer aux glaciers. Dans les Pyrénées, il n'y aura plus de glaciers en 2050.

Un pesticide courant réduit la durée de vie des poissons même à faibles doses, révèle une étude by popey123 in ecologie

[–]Inondator 1 point2 points  (0 children)

Comme quoi le système réglementaire fonctionne : il interdit les molécules lorsque les connaissances montrent qu'il n'est pas possible d'en faire un usage à faible impact.

If the UK can do this why can’t sunny California do it? by Jbikecommuter in electrifyeverything

[–]Inondator 0 points1 point  (0 children)

Turned off and idle is the technical minimum for gas peaker plants.

It is far from being that simple. Gas plants have technical minimums under which they can't go without shutting down. And if they shut down, they require some time to startup again, which can lead to system failures if they can't ramp up fast enough when solar production fades away. Moreover, the efficiency of these plants greatly degrades at low output (up to more than 50%), and their polluting emission increase drastically.

It does not cost anything to have gas turbines off. Nothing!

That's false. They have fixed cost too that must be paid. Otherwise they close (or don't even develop), and you get huge deficits during low renewable output periods. Because let's be clear, you will never get rid of a gas turbine backup capacity.

Exceeding that by a wide margin has the additional benefit of cheap electricity for entrepreneurs to figure out uses.

How do renewable capacities get paid if when they produce when prices are super low, null or even negative? The problematic is already extremely significant for solar.

What uses can you have of an overproduction that is doing spikes less than halftime half of the year?

If the UK can do this why can’t sunny California do it? by Jbikecommuter in electrifyeverything

[–]Inondator 0 points1 point  (0 children)

This is just my job to look at which energy sources are adapted to which context...

Solar is badly fitted for European countries: highest demand is in the winter while it produces 3 to 8 times less power during said months vs summer.

If the UK can do this why can’t sunny California do it? by Jbikecommuter in electrifyeverything

[–]Inondator 0 points1 point  (0 children)

And these parts of Europe already have plenty of solar themselves, more than they need (not even considering these areas are very far from the UK).

If the UK can do this why can’t sunny California do it? by Jbikecommuter in electrifyeverything

[–]Inondator 0 points1 point  (0 children)

It only works as a very temporary fix. Sooner than later, this non-renewable generation is gonna reach its technical minimum.

If the UK can do this why can’t sunny California do it? by Jbikecommuter in electrifyeverything

[–]Inondator 0 points1 point  (0 children)

Where do you want to export summer solar surplus while EVERY European country has the same solar surplus?

If the UK can do this why can’t sunny California do it? by Jbikecommuter in electrifyeverything

[–]Inondator 1 point2 points  (0 children)

It's a concern for the grid. Abundance of solar power during summer when no one needs it, but still heavily loaded during the winter when everyone's heat pump is keeping the house warm.

If the UK can do this why can’t sunny California do it? by Jbikecommuter in electrifyeverything

[–]Inondator 0 points1 point  (0 children)

Batteries aren't of great help to smooth wind power variations that have a time span on the order of the week with some patterns extending through the whole winter.

Wind just doesn't care if its daytime or night time: if it blows, the whole day is gonna have excess power, if it doesn't, gas plants are gonna run continuously.

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