Europe's ageing power grid and lack of energy storage capacity will require trillions of dollars in investments to cope with rising green energy output, increasing electricity demand and to avoid blackouts.

Everything stopped in Spain as people struggled to power their homes. Stakeholders now wonder about the reliability of increased renewables while champions defend them.

Spain’s nationwide blackout this week has put a spotlight on potential vulnerabilities in its system that may offer warnings to other countries, as rising electrification and clean energy sources place new demands on power grids around the world.