Germany's clean spark spread moved from -€44/MWh on Monday 15 June to roughly +€15/MWh on Wednesday 17 June, a €59 reversal in two sessions, on data from euenergy.live1. The clean spark spread is the running margin on a combined-cycle gas turbine (CCGT): day-ahead power price, minus the gas cost to generate it, minus the carbon cost of the emissions. When it turns negative, plants lose money to run and shut in; when it turns positive, they have a commercial reason to burn gas. On 15 June it sat at -€44 and CCGTs were off-merit; by 17 June the same plants cleared roughly €15/MWh of running margin.
The swing came from both legs moving at once. German day-ahead power jumped 59% from its €74 trough to €117.63/MWh as the thermal stack reset the marginal price, while TTF fell 6% on the session, extending the slide that had driven the -€44 reading. EUA carbon at €79.78/tonne is the period high and the binding cost input: against a CCGT marginal cost near €102.7/MWh, the €117.63 clear leaves roughly €15/MWh of margin2.
The injection story changes with the spread. Since the German storage levy lapsed on 1 January, the only injectors bidding for prompt molecules have been the Dutch (EBN), French (CRE) and Italian (ARERA) storage mandates. A positive spark spread puts a commercial thermal bid back alongside them for the first time since January. Two buyers chasing the same gas tends to support the price, which makes the recovery self-limiting: a small further rise in TTF or EUA at this carbon cost would tip CCGTs back off-merit, so the +€15 reading is fragile rather than a settled pattern.
