Candidate engines included variants of Rolls-Royce's Trent 1000 and General Electric's GEnx-1B. Both engine makers were reportedly interested in winning an exclusive deal should a re-engined A330 be offered.
The Trent 1000 TEN (Thrust, Efficiency, New Technology) engine is under development for the 787-10, but Rolls-Royce intends to offer a broad power range.

The A330neo will use the Rolls-Royce Trent 7000 engine, which is an electronic controlled bleed air variant of the Trent 1000 used on the Boeing 787-10.
It will have a 112 in (284 cm) diameter fan and a 10:1 bypass ratio.
They will deliver a thrust of 68,000 to 72,000 pounds-force (300 to 320 kN).

The Trent is the exclusive powerplant, as Rolls-Royce offered better terms to obtain exclusivity.
Customers bemoan the loss of competition among engine makers: Steven Udvar-Hazy, CEO of Air Lease Corporation, said that he wants a choice of engines, but Airbus has pointed out that equipping a commercial aircraft to handle more than one type of engine adds several hundred million dollars to the development cost.
The head of Pratt and Whitney said: "Engines are no longer commodities...the optimization of the engine and the aircraft becomes more relevant."

The decision to offer the aircraft with only one engine option is not unique to Airbus; the Boeing 777X will come equipped exclusively with General Electric GE9X engines, after Rolls Royce made a bid with its Advance configuration but was not selected.
Candidate engines included variants of Rolls-Royce's Trent 1000 and General Electric's GEnx-1B. Both engine makers were reportedly interested in winning an exclusive deal should a re-engined A330 be offered. The Trent 1000 TEN (Thrust, Efficiency, New Technology) engine is under development for the 787-10, but Rolls-Royce intends to offer a broad power range.
The A330neo will use the Rolls-Royce Trent 7000 engine, which is an electronic controlled bleed air variant of the Trent 1000 used on the Boeing 787-10. It will have a 112 in (284 cm) diameter fan and a 10:1 bypass ratio. They will deliver a thrust of 68,000 to 72,000 pounds-force (300 to 320 kN).
The Trent is the exclusive powerplant, as Rolls-Royce offered better terms to obtain exclusivity. Customers bemoan the loss of competition among engine makers: Steven Udvar-Hazy, CEO of Air Lease Corporation, said that he wants a choice of engines, but Airbus has pointed out that equipping a commercial aircraft to handle more than one type of engine adds several hundred million dollars to the development cost. The head of Pratt and Whitney said: "Engines are no longer commodities...the optimization of the engine and the aircraft becomes more relevant."
The decision to offer the aircraft with only one engine option is not unique to Airbus; the Boeing 777X will come equipped exclusively with General Electric GE9X engines, after Rolls Royce made a bid with its Advance configuration but was not selected.
Airbus A330neo