What Happens When the Wind Stops?
🔥 What Happens When the Wind Stops?
On a cold, still January night in 2021, something worrying happened across the UK. The wind turbines slowed. Solar panels produced nothing — it was dark. Gas power stations had to race to fill the gap. It worked that night. But it raised a question every energy planner has to answer: what do we do when our renewable sources stop generating?
Britain's energy mix has changed radically in the last 20 years. In 2010, coal provided around 28% of our electricity. By 2023 it was close to zero. Offshore wind, solar, and nuclear have grown enormously. But switching from reliable, always-on fossil fuels to intermittent renewables creates a new kind of challenge — and a new kind of urgency. Understanding where our energy comes from, how reliable it is, and what it costs the environment is one of the most important real-world applications of physics.
Physics glossary
- What is a renewable energy resource?
- A renewable energy resource is one that is naturally replenished and will not run out on a human timescale. Examples include wind, solar, tidal, hydroelectric, geothermal, wave, and biofuel.
Non-renewable resources are those that cannot be replenished on a human timescale — once used, they are gone. There are four main categories:
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🧠 Memory Aid: Renewable Sources
Use the acronym SHWGTB to remember the six main renewable energy sources:
- S — Solar (light from the Sun)
- H — Hydroelectric (falling water)
- W — Wind (moving air)
- G — Geothermal (heat from the Earth)
- T — Tidal (Moon's gravitational pull)
- B — Biofuel (organic material)
Wave power is sometimes listed separately — if you need to remember it too, add a second W: SHWGTBW.
For non-renewables, remember "CONK": Coal, Oil, Nuclear, gaK (Gas). Or more naturally: Coal, Oil, Gas, Nuclear — the four non-renewables.
Quick Check: Which two renewable sources are most reliable (predictable)?
Tidal power (predictable because tides are caused by the Moon's gravity, which follows a reliable cycle) and geothermal power (heat from inside the Earth is available 24/7). Hydroelectric is also very reliable when there is sufficient water in the reservoir.
Now try it yourself
Quiz · Question 1 of 15
Which of the following is a renewable energy resource?
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