Spain cleared at EUR 71.91/MWh in day-ahead power on 15 April, up 148% from EUR 29/MWh on 13 April and compressing the Italy-Spain spread from EUR 104 on Monday to EUR 70 on Wednesday, a 33% narrowing in two sessions 1. Italy cleared at EUR 141.90/MWh, France at EUR 72.41, Germany at EUR 117.53; the ENTSO-E feed shows the Italy-Germany gap widening while the Franco-Iberian pair moved to near-parity.
The prior briefing had positioned the Italy-Spain gap as the canonical case of merit-order divergence, with gas setting Italy's price the majority of hours and wind plus solar setting Spain's . A 148% one-way move over two sessions is the mechanism in reverse: a low-wind day compounded by hydro de-rating pushed Spanish gas-fired peakers up the merit order, clearing into a gas-set stack. Iberian insulation is a probability-weighted advantage across a year, not a constant across a day.
France printing EUR 45 beneath Germany on the same day points to the setup through Q2: French nuclear surplus behaves like a southern-European asset, and the Franco-Iberian interconnector becomes the arbitrage of the week on any repeat low-wind print.
The implication for industrial relocation arguments that lean on Iberian power-cost structure is that those arguments survive only if the user can tolerate the dispersion around the mean. On a low-wind day Spain prices into the gas stack; on a high-wind day it prices off the renewables stack. The day-ahead print, not the monthly average, is what settles P&L.
