The 140 meter long, 2685 dwt  ro-ro ferry RG1 suffered a power blackout while sailing from Vaasa, Finland to Umea, Sweden.   The RG1 was only 1/2 hour into a three hour voyage when the power failure occured.  The ferry dropped anchor while the crew attempted to restore power.   An hour later, power was restored and the RG1 proceeded to Umea.   There were 130 passengers on board during the incident.  No reports of injury, damage or pollution being released.