Date: 201504
Local time of day: 1801-2400
Location: ZZZ.ARTCC, US
Flight conditions: VMC
Light: Night
Aircraft: A320
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Cruise
Airspace: Class A ZZZ
ATC / advisory: Center ZZZ
Aircraft component: Hydraulic Main System
Component problem: Failed
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Commercial
Anomaly: Aircraft Equipment Problem Less Severe
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Diverted; Flight Crew Landed in Emergency Condition
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: In cruise flight from Airport ZZZ to Airport ZZZ1; we experienced a green HYD overheat that went away after about 30 seconds. A few minutes later; we experienced a green HYD low pressure that did not go away. While running ECAM actions and QRH follow up; we noted the green system reservoir showed 100% overfill.  However; the PTU (Power Transfer Unit) was doing its job and supporting the system. At this point we contacted Maintenance Control and Dispatch via ACARS with the problem to see if they wanted us to continue to Airport ZZZ1. After several minutes delay and a fuel inquiry; Dispatch advised us they wanted us to return to Airport ZZZ. We advised ATC and were turning back to Airport ZZZ when we had a total failure of the green HYD system. Reservoir content dropped to 0% and ECAM told us to shut the PTU off. At his point the Captain [notified ATC of urgency] and requested vectors to Airport ZZZ2; which was 80 miles north of us and the closest airport. I advised Dispatch we were diverting.Enroute to Airport ZZZ2 we requested lower and delay vectors to run QRH checklists for overweight landing; Landing Gear Gravity Extension; Emergency Landing Checklist and Non-Normal Landing Distance Procedures. We reviewed the Status page extensively as many systems were effected. On the downwind; we configured early; and I landed overweight on [RWY XY] at 145;400 LBS; at less than 300 FT per min. sink rate. Fire trucks were standing by. With no nose wheel steering we were towed to the gate. We got another airplane and continued to Airport ZZZ1. A total failure of the Green HYD system. I believe all green system fluid was lost. Both the Captain and I were surprised at the lack of advice in the QRH for this particular system failure.  However; the STATUS page was extremely helpful in letting us know how we were affected. We were both surprised at how long it took to hear back from Dispatch and Maintenance Control concerning our problem. In this situation; someone should at least let us know they have received our messages if they are 'working on it.' I found ATC and dispatch inquiry to be highly distracting while trying to run QRH checklists; but I understand the necessity.  I thought my Captain did a superb job as pilot not flying while working with the ECAM and QRH. Extremely professional and we worked well together as a team.




Synopsis: A320 First Officer reported loss of Green system hydraulic fluid in cruise flight. The flight diverted to a suitable airport and landed in emergency condition.