Konami has announced that they are temporarily suspending Metal Gear Online play to do their part to conserve electricity in the wake of the devestating 8.9 earthquake and subsequent tsunami that devestated Japan on Friday morning.
Power companies have been asking all consumers to conserve electricity. Konami is doing its part by suspending service on Metal Gear Online. They have yet to announce a restart date.
This will also affect the game outside Japan, as Kojima Productions have tweeted the news in English.