A blackout of historic proportions on the Iberian peninsula April 28 has sparked a debate on responsibility and prevention, while the investigation into the causes is ongoing. 

One undeniable conclusion is that investments in grids are becoming more important, S&P Global Commodity Insights analysts Kerry Thacker-Smith and Alexandre Mace explain on this episode of Energy Evolution. 

Albéric Mongrenier, executive director of think tank European Initiative for Energy Security, argues that grids have become a key frontier in Europe's push for more independence and security.