UK wind and solar generation exceeded fossil fuels for 15 consecutive months, including the entire 2025-26 winter—the first time renewables sustained this lead through a full winter season. This matters because winter has historically been fossil fuels' strongest season in the UK, making this a significant structural shift in the energy system. The £1.7 billion in avoided gas imports since the Iran war began shows renewables aren't just an environmental story but an economic insulator against energy supply shocks, though the Guardian piece flags that this doesn't yet solve the UK's broader energy security challenges without sustained investment in storage and grid infrastructure.