Air carrier First Officer reported electrical malfunctions and flap disagree indications.

Narrative

Flight originated in ZZZ1 for ZZZ with no MEL/CDLs (Configuration Deviation List); but the maintenance history of the aircraft showed a recent write up for L GEN OFF and L AC BUS OFF. This write up had been closed. During cruise at FL 350; the L GEN and L AC BUS were lost and the L BUS TIE was in ISLN (Isolation). As directed by the QRH; the L GEN was reset and normal operations resumed with no anomalies. During our approach in to ZZZ we once again lost L GEN; L AC BUS and L BUS TIE was in ISLN. Also; approach advised that a thunderstorm cell was moving towards our selected approach ILS XX L and asked if we would like to switch to the RNAV XY approach. We asked for a hold to run necessary checklists and to evaluate the conditions. Because we could not reset the L GEN more than once during flight per the QRH; and we had no autopilot; we decided to use the ILS XXL approach. The conditions improved prior to initiating the approach. We were cleared for the ILS XXL approach and established on the final approach course. As we configured for the approach and landing; we realized that the flap indicator was in disagreement with the flaps selected. We discontinued the approach and asked for a delay vector to run the QRH for Flap Indication Disagree. During this checklist; we lost the lower EICAS screen in addition to the top EICAS screen. We also noticed an EQUIP OVRHT message. We asked approach control for a vector back to the approach; but due to other inbound aircraft; we were instructed to continue our current heading. At this point; due to continued degradation of our equipment; we requested priority handling to get on the ground as soon as possible. The approach and subsequent landing were in visual conditions and executed without further event.Cause: L GEN OFF; L BUS TIE ISLN causing a loss of the left AC BUS system. Per the QRH; one L GEN reset was accomplished and the failure was resolved temporarily. A second failure occurred and per the QRH; we could not reset the L GEN again.