Price shape is an operating question, not a slogan.
Sunday's 77.6% ratio is the counterexample to any claim that solar cannibalisation has ended. It shows a substantial daylight discount during a week with no negative 15-minute spot price in the retained daily reference series. Developers should stress-test the return of more abundant generation: a stronger solar build-out, more wind, improved nuclear availability or weaker demand can move prices without changing the PV hardware.
We would calculate three measures for every asset: the generation-weighted spot price, the achieved net price after balancing and offtake, and the restricted-energy value after dispatch or export limits. Each measures a different risk. The first answers market exposure, the second cash settlement, and the third whether the plant can physically sell the energy it could otherwise produce.
A 100 RON/MWh change in achieved price across 1,000 MWh delivered changes gross proceeds by 100,000 RON before costs. This arithmetic is a sensitivity, not a claim that any particular project generated or sold that volume. Investor committees should put this sensitivity beside a revised schedule and connection cost, rather than looking at PZU headlines alone.
Three capture cases—not one new assumption.Maintain separate observed-scarcity, normal-conventional-supply and high-simultaneous-renewables price decks. Match each to project-specific PT15 output and export restrictions, including the 25 October daylight-saving transition (100 rather than 96 quarter-hour slots). A direct realised-revenue bridge is mandatory before adjusting debt sizing.
On 22 and 27 October the daytime proxy exceeded the respective PZU daily base. On Sunday 25 October the ratio fell to 77.6%, and the lowest reported PT15 value was still positive at 578.94 RON/MWh. The coexistence of a positive price floor and a steep relative daytime discount shows why "no negative prices" cannot be confused with "no cannibalisation". [S01]
The production-weighted spot capture price is Σ (PT15 PZU price × matched PV MWh) / Σ matched PV MWh. The realised cash outcome then requires balancing costs, contracted offtake pricing, permitted export, curtailment, settlement and applicable fees. An unweighted 08:00–17:00 average does not answer either question. Do not use 95.1% as a project capture factor or as a bankable long-term merchant price.