As we head towards summer, it looks like the lights will go out for some of us. 

The energy market operator predicts blackouts in some parts of the country because governments have failed to replace ageing coal plants with renewable power fast enough. 

Today, energy expert at the Grattan Institute Alison Reeve on why we have to rely on coal power for longer than expected. 

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Alison Reeve, Climate Change and Energy Deputy Program Director at Grattan Institute