Solar Sends European Power Prices On A Wild Daily Roller Coaster

Europe's daily power price swings are growing more extreme as a midday flood of solar generation gives way to an evening supply crunch, exposing how much work remains to adapt the region's grid to the energy transition.

Almost every day this summer, prices plunge around midday as solar output swamps the grid, then spike sharply in the evening as the sun sets and demand climbs, particularly when hot weather drives up cooling use.

Analysts call the pattern a duck curve, named for the shape it traces on a price chart. The swings now unfold within just a few hours and outpace the volatility seen in most other commodity markets.

On one late May day in Germany, Europe's largest economy, prices moved from below zero around noon to nearly €400 per megawatt-hour by 8 p.m., according to Bloomberg.

The pattern has already produced record-setting extremes this year. On April 27, German hourly prices fell to negative €413.77 per megawatt-hour between 1 p.m. and 2 p.m. as strong solar output met weak weekend demand, with neighbouring France dropping to negative €412.55 for the same hour.

Three days later, prices fell further still. Hourly rates in Germany and France approached negative €500 per megawatt-hour during early afternoon delivery on April 30, as strong solar generation coincided with public holidays across much of the region, pushing France's day-ahead price to a record low.

The volatility highlights a structural challenge for grid operators as solar capacity keeps expanding across Europe. Absorbing surplus midday power and covering the evening gap both require flexible generation, storage or demand response that many national grids are still building out.