**This report was modified on 10/28/2014. Please see the public docket for this accident to view the original report.**On April 2, 2008, about 1423 Pacific daylight time, an experimental Bennett Lancair 320, N456, landed with the nose gear and left main landing gear retracted at Portland-Hillsboro Airport, Portland, Oregon. The pilot/owner was operating the airplane under the provisions of 14 Code of Federal Regulations (CFR) Part 91. The certificated private pilot and one passenger were not injured; the airplane sustained damage to the wing spar that was determined not to be substantial. The local personal instructional flight departed Hillsboro at 1300. Visual meteorological conditions prevailed, and no flight plan had been filed. The pilot stated that while in cruise flight, the airplane lost electrical power. The pilot immediately turned off the radios and intercom in order to try to save electrical power. He also went through emergency procedures for a loss of electrical power. The pilot flew back to the Hillsboro airport through Columbia Gorge in case he had to make an emergency landing. The pilot attempted to bring the gear down, but only heard the right main gear go down and lock. The left main gear and the nose gear did not seem to go down. The pilot stated that he went through the emergency checklist, but there is no emergency gear extension system installed on the airplane. He returned to the Hillsboro area, and received a green light-gun signal to land from the local tower. While landing, the landing gear collapsed about 500 or 600 feet down runway 30. The airplane skidded and the right main gear snapped off. The airplane went off the left side of the runway onto the grass, shearing off an intersection marker. The pilot reported that after the occurrence, tower personnel told him that when he had flown by, the gear "did not look good." Several times during the flight the pilot checked and did not see any blown fuses. He had pulled a fuse himself and then reset it in order to "relieve pressure from the system." After the occurrence, the pilot tested the battery and found that it had a dead cell. He also found discrepancies with the alternator. He found no anomalies within the wiring or fuses.