As part of the efforts to conserve Japan's electricity usage in the wake of the Sendai earthquake and tsunami, Square Enix and Konami are temporarily shutting down servers for Final Fantasy XI, Final Fantasy XIV, PlayOnline, and Metal Gear Online.
Final Fantasy XI and FFXIV's servers were shut down at 3 p.m. PST on March 13 and are scheduled to be down for a week. In addition, players won't be billed for the April billing cycle. The FFXIV Lodestone site, official game forums, and Square Enix support center will provide updates when available.
Metal Gear Online servers have been down since March 12. Kojima Productions is unsure about when they'll be brought back online.