Pratica di Shadowing: How to fix clean energy’s storage problem - Impara a parlare inglese con i video
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This is the typical demand for electricity on a spring day in California.
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It starts growing around 6 a .m., then rises again around 6 p .m.
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Now, this line shows when wind power feeds the California power grid.
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Wind is variable, but often picks up at night.
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Solar panels, on the other hand, kick into gear around 7 a .m., generate a lot of electricity until the sun sets around 7 p .m.
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On most days, neither comes close to meeting the peak demands of the day.
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So, the power company relies on fossil fuels, like natural gas, to make up for the gap, which widens significantly when people use electricity the most.
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Since the power company can't store the solar and wind energy, it has to use fossil fuels at these times,
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which can be stored in barrels and tanks.
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It's kind of the big gap in our renewable energy system right now.
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If we don't figure out a way to store renewable energy, there's a chance that we're going to be still dependent on fossil fuels.
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So, how do we store some of this solar and wind energy for later?
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Right now you might be thinking, just use a battery.
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And you're not wrong.
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Batteries have improved immensely over the past few years, particularly lithium -ion batteries, which use a chemical reaction to store energy.
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Individual homes that have solar panels often use lithium -ion batteries to store energy.
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But there's a few reasons lithium -ion isn't perfect for the grid.
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This is Neil Dinesha, a founding writer at Heatmap, a climate news site, and he wrote about this for Vox in 2022.
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One is just the scale that's needed.
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We would need a lot at a level that we just don't really have right now.
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That's a challenge because lithium is only found in a few places on earth.
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But more importantly, like we need lithium -ion batteries for other things.
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Lithium -ion battery is really good for stuff that moves because it's relatively light.
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Meaning it's better suited for things like electric cars and portable electronics, not power grids that stay still.
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Luckily, there's another energy storage solution that's actually been around for a long time.
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This is the site for the first pump storage hydroelectric station in Southern Ireland.
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This is a type of energy storage called pump storage hydro.
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They were first built in Europe.
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The U .S built one in 1929.
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And many more were built in the 1970s and 80s as a way to store nuclear power.
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Today, these facilities are all over the world.
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There are 39 of them in the U .S.
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And they store energy in a really fascinating yet simple way.
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When energy demand is low,
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renewable or fossil fuel energy is used to pump water from a reservoir or river up a mountain into a higher reservoir.
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Basically converting this energy into what's called potential energy.
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So potential energy, you might kind of remember from high school physics.
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When a thing is up at a height, it has stored potential energy.
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When it's let go, it turns into kinetic energy.
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When that energy is needed, the water is released down the mountain,
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where it's converted into kinetic energy that spins a turbine and generates electricity for the grid.
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It's a way of combining water, a mountain, and gravity into a battery, and it can be about 90 % efficient,
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meaning only 10 % of this energy is lost in the process.
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Pump storage hydro works really well, but it's difficult to build more.
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Well, for starters, you need a mountain, and you need to haul out a mountain to put pumps inside it,
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and it takes a lot of money, and we don't have mountains everywhere.
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So the ideal way to store renewable energy would be something that's cheaper and smaller than a pump storage hydro plant,
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but works in roughly the same way.
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One company, Energy Vault, is also using gravity to store renewable energy, but without the water or mountain.
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Instead, renewable energy is used to lift heavy blocks of concrete up into the air, where it becomes potential energy.
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Then when it's needed, the blocks are released, spinning a turbine, which converts the potential energy back into electricity.
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Energy Vault calls this gravity energy storage, and while it's still being tested, the company claims it could be more than 80 % efficient.
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A company called QuidNet is working on a different version of the same principle.
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Their geomechanical pump storage unit uses renewable energy to pump water underground into a pressurized hole, where it can be stored as potential energy,
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then released back up to the surface to spin a turbine and generate electricity.
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Both techniques are betting on potential energy as a solution for storing renewable energy for the grid.
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I think this partly because potential energy has shown itself to be pretty efficient.
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Also, realistically, fewer moving parts.
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If all you're doing basically is using gravity to work with you, you have a pretty massive force of nature on your side right there.
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But potential energy isn't the only possible solution.
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Other companies are using renewable energy to superheat salt, insulating it, then releasing that heat to create steam or hot air to drive a turbine.
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Basically storing renewables by converting them to thermal energy.
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Then there's a company that's betting on rusted iron.
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They're called iron air batteries and what they do is they utilize the chemical reaction
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that creates rust to store and discharge energy.
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This thing
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that we all sort of think of as an inconvenience could be really useful is just kind of beautiful to me.
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Right now these ideas are all in various stages of development, but they are attracting investors.
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And the hope is that several will work because one might not fit every power grid.
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The grid, renewable energy overall, is going to be a sort of patchwork solution.
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And so the more we try these solutions,
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the closer we get to figuring out exactly what the right mix is for what we need for the greater future.
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Vocabolario e note di pronuncia per questa lezione
Questa lezione di conversazione si basa sul video “How to fix clean energy’s storage problem”. Le parole che ritornano più spesso: energy, renewable, store, potential, pump. Questo video contiene 72 frasi e 1011 parole da ripetere con lo shadowing. Il parlato dura 5:21. Chi parla va veloce, circa 189 parole al minuto: aspettati suoni legati e ridotti. Solo il 79% delle parole rientra nelle 3.000 più comuni dell’inglese, quindi il lessico è impegnativo.
Vocaboli chiave di questo video
15 parole del video che vale la pena imparare, con pronuncia e significato:
| Parola | Pronuncia | Significato |
|---|---|---|
| renewable aggettivo | /ɹɪˈnu.ə.bl̩/ | rinnovabile |
| pump sostantivo | /pʌmp/ | pompa |
| grid sostantivo | /ɡɹɪd/ | griglia, grata |
| lithium sostantivo | /ˈlɪθi.əm/ | litio |
| gravity sostantivo | /ˈɡɹævɪti/ | gravità |
| convert verbo | /kənˈvɝt/ | convertire |
| fossil sostantivo | /ˈfɑsl̩/ | fossile |
| turbine sostantivo | /ˈtɜː.baɪn/ | turbina, rotore |
| efficient aggettivo | /ɪˈfɪʃənt/ | efficiente, performante |
| spin verbo | /spɪn/ | girare, far girare |
| generate verbo | /ˈd͡ʒɛn.ə.ɹeɪt/ | generare |
| reservoir sostantivo | /ˈɹɛz.ə(ɹ).vwɑɹ/ | invaso, bacino |
| rust sostantivo | /ɹʌst/ | ruggine |
| technique sostantivo | /tɛkˈniːk/ | tecnica |
| gear sostantivo | /ɡɪɚ/ | attrezzo, parafernalia |
I phrasal verb che sentirai
| Parola | Significato |
|---|---|
| figure out verbo | scoprire, rendersi conto |
La grammatica di questo video
Le strutture che chi parla usa di più, con le parole esatte del video:
| Struttura | Nel video |
|---|---|
| Forma passiva be + participio passato — conta ciò che accade, non chi lo fa | can be stored · is only found · were built |
| Present perfect have/has + participio passato — un’azione passata che conta ancora adesso | have improved · that's actually been · has stored |
Pronuncia a cui fare attenzione
Chi parla usa 10 contrazioni e forme ridotte, come don't, isn't, you're. Pronunciale nella forma breve, così come le senti.
- I suoni “th”: lithium /ˈlɪθi.əm/, thermal /ˈθɜːməl/
- I suoni “sh” e “zh”: efficient /ɪˈfɪʃənt/, pressurize /ˈpɹɛʃəɹaɪz/
- Parole lunghe — attenzione all’accento: electricity /ɪˌlɛkˈtɹɪsɪti/, electronics /ɪˌlɛkˈtɹɑ.nɪks/, importantly /ɪmˈpɔɹ.tənt.li/, inconvenience /ɪnkənˈvinjəns/, hydroelectric /ˌhʌɪdrəʊɪˈlɛktrɪk/
I suoni difficili per chi parla italiano:
- /h/ — va soffiata, non è muta: hydro /ˈhaɪdro/, haul /hɔl/, hydroelectric /ˌhʌɪdrəʊɪˈlɛktrɪk/
- Consonante finale — senza aggiungere una vocale dopo: pump /pʌmp/, grid /ɡɹɪd/, convert /kənˈvɝt/, efficient /ɪˈfɪʃənt/, generate /ˈd͡ʒɛn.ə.ɹeɪt/
- /æ/ — più aperta della “e”: gravity /ˈɡɹævɪti/, attract /əˈtɹækt/, barrel /ˈbæɹəl/, variable [ˈvæɹ.i.ə.bl̩], fascinate /ˈfæsɪneɪt/
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Inizia a velocità 0,75×, fai shadowing frase per frase e torna alla velocità normale quando diventa facile.
- Registrati e confronta con l’originale, facendo attenzione a parole come renewable, pump, grid.
Cos'è la tecnica dello Shadowing?
Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.