According to Wiki, they generate
- Hydro: 160 / 8.521 million kW
- Thermal (oil, coal, LN(P)G, geothermal): 26 / 36.995 million kW
- Nuclear: 3 / 17.308 million kW
- Wind: 1 / 0.001 million kW
- Total: 190 / 62.825 million kW
If i do my math correctly, 27% of the power is from nuclear. Fukushima I Nuclear Power Plant contribute 40% of the nuclear power. That also means. That power plan count as 11% of entire Tokyo Electric's power generation capacity.
Stock price drop from normal level of $24 to today's $5.8. Thats means 75% of the company's valuation evaporative due to this accident. Is it too much? Time will tell