*Will Mathis, Tom Fevrier and Hayley Warren for Bloomberg News*
When an early warning system designed to alert operators across Europe about disturbances on the grid was rolled out a decade ago, the predominant color showing on the on-screen maps was green. Safe with no disruptions.
More recently it has become common for the maps in grid control rooms to light up amber, red, and on occasion even black for blackout. The widely-used traffic light model is a real-time illustration of how solar’s rapid success — with roughly four panels being installed somewhere in Europe every second — is colliding with the limits of a grid built long before renewables became central to power generation.
The situation is getting more difficult to manage and operators say they lack the tools they need to balance out the effects of solar, according to interviews with more than a half-dozen European grid managers. Getting it wrong or failing to act has severe consequences like the lights going out.
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*Will Mathis, Tom Fevrier and Hayley Warren for Bloomberg News*
When an early warning system designed to alert operators across Europe about disturbances on the grid was rolled out a decade ago, the predominant color showing on the on-screen maps was green. Safe with no disruptions.
More recently it has become common for the maps in grid control rooms to light up amber, red, and on occasion even black for blackout. The widely-used traffic light model is a real-time illustration of how solar’s rapid success — with roughly four panels being installed somewhere in Europe every second — is colliding with the limits of a grid built long before renewables became central to power generation.
The situation is getting more difficult to manage and operators say they lack the tools they need to balance out the effects of solar, according to interviews with more than a half-dozen European grid managers. Getting it wrong or failing to act has severe consequences like the lights going out.
[Read the full story here.](https://www.bloomberg.com/graphics/2025-europe-solar-power-boom/?accessToken=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzb3VyY2UiOiJTdWJzY3JpYmVyR2lmdGVkQXJ0aWNsZSIsImlhdCI6MTc2MTY0OTM3NSwiZXhwIjoxNzYyMjU0MTc1LCJhcnRpY2xlSWQiOiJUNFRZRFlHUEw0OFMwMCIsImJjb25uZWN0SWQiOiJEMzU0MUJFQjhBQUY0QkUwQkFBOUQzNkI3QjlCRjI4OCJ9.Tg_UGZSpJMS-evbnlOED8ECxWnLKEFBduqw2ijIMWUo)