Electricity prices in France turn negative as renewable energy floods the grid

Cross‑border transmission and price gaps

• France’s negative day‑ahead price vs positive German price sparks discussion of building more interconnectors.
• Back‑of‑envelope: 250 km, ~€2M/km, 2 GW capacity → ~€500M capex; with a ~€13/MWh spread, payback in a few years. Others note competition and narrowing spreads may erode this.
• Several comments say the real constraint is limited interconnector capacity, not transmission losses.
• Some argue incentives are already aligned, so profitable interconnect projects will happen without extra intervention.

Nuclear flexibility and cost effectiveness

• Disagreement over whether French reactors can load‑follow; some say they regularly do, others claim nuclear is economically poor for load‑following and even as baseload in some contexts.
• Example data from Ontario used to argue nuclear can be cost‑competitive baseload; others say high overnight fixed‑price structures hide inefficiencies.
• Point raised that as renewables grow, nuclear capacity factors fall, effectively raising nuclear LCOE unless system is planned carefully.

Renewables, negative prices, and storage

• Negative prices are framed by some as a clear signal for more storage (grid batteries, pumped hydro, EVs, domestic batteries) and more interconnects.
• Others worry negative prices de‑incentivize investment in generation and indicate “useless capacity,” ultimately favoring fossil backup in winter and long low‑renewable periods.
• Examples from California, the UK, Australia, NL, and others: frequent negative or near‑zero prices already driving storage, curtailment, and flexibility products.

Impact on consumers

• Retail customers typically see fixed or time‑of‑use tariffs; spot negatives rarely translate directly to being paid for consumption.
• Some markets offer dynamic tariffs or EV‑optimized tariffs that exploit cheap/negative hours to charge cars or home batteries.

Nuclear vs renewables debate

• Long thread on whether nuclear is “the future” given France’s prices are not “too cheap to meter.”
• Arguments against nuclear: high capex and opex, long builds, water constraints, political and safety overhead, need for heavy state support.
• Arguments for nuclear: reliable low‑carbon baseload compared to intermittent renewables; France as proof of deep decarbonization.
• Several predict renewables + storage will outcompete nuclear on cost; others stress the need for a diversified mix and caution against assuming storage prices will always fall.

Market design and flexibility

• Econ discussion: with near‑zero marginal cost generators, pure per‑kWh pricing struggles to recover fixed costs.
• Proposals: capacity markets and paying for available power, not just energy; more flexible demand (industry, EV charging, hot‑water loads) tied to real‑time prices.
• Some see intermittent “free” power as an opportunity for flexible industrial processes; others doubt many industries can economically operate on highly variable schedules.