Why did TEPCO stock fall today?

The stock slid 3.5% after Tokyo Electric Power halted the Kashiwazaki-Kariwa Unit 6 restart due to an alarm during control-rod withdrawal. The delay threatens expected fuel-cost savings from nuclear generation and extends reliance on pricier thermal power. That uncertainty pressured sentiment and pushed TEPCO stock lower on strong volume.

How does the Kashiwazaki-Kariwa reactor affect profits?

Nuclear power lowers fuel costs versus thermal generation, which improves margins. A delay at the Kashiwazaki-Kariwa reactor means higher short-term costs and weaker profitability until the unit runs stably. For TEPCO stock, the restart path is a key driver for earnings visibility and potential re-rating over the next few quarters.

Is TEPCO stock cheap or risky right now?

It screens inexpensive on P/B around 0.37 and P/S near 0.17, but carries risks. EPS is negative, debt-to-equity is about 2.16, and the current ratio is 0.48. Until the restart is stable and cash flow improves, TEPCO stock can remain volatile despite low headline valuation multiples.

What should I watch before earnings on January 29?

Focus on the investigation outcome, any new restart timetable, and management commentary on fuel costs if thermal use is extended. Watch price versus the 50-day average around ¥717 and volume trends. These signals will help gauge whether sentiment in TEPCO stock stabilizes or weakens post-results.

Global Market Insights

9501.T Stock Today: January 23 TEPCO Halts Reactor After Restart Glitch

ByHuzaifa Zahoor January 23, 2026January 23, 2026

TEPCO stock fell after Tokyo Electric Power halted the Kashiwazaki-Kariwa Unit 6 just hours after restart. An alarm during control-rod withdrawal forced a shutdown and investigation. TEPCO stock traded at ¥695.5, down 3.48%, with heavy volume. Investors in Japan worry the delay pushes back nuclear-driven cost savings and keeps pricier thermal generation in the mix. We break down what happened, how the market priced it, key valuation markers, and what to watch into the January 29 earnings update.