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Could solar weather knock out our power grids? Manuela Saragosa speaks to Nasa consultant Dr Daniel Baker about space weather and how it's monitored, Trevor Maynard, head of exposure management at Lloyds of London, about the risks posed to electricity grids around the world, and Andrew Richards, severe risk and resilience analyst at the UK's National Grid, about how our electricity supplies can be protected.

Producer: Laurence Knight

(Photo: A Solar Flare, Credit: Solar Dynamics Observatory/Nasa/Science Photo Library)