The new Geneo-Hybrid forklift has maximum load capacity of 3,500 kg, and combines a 2.5-liter diesel with a NIMH battery pack and motor. The system operates as a series hybrid system when the forklift is driving, with the engine powering a generator. It operates as a parallel hybrid system which the battery-powered motor and the engine both power a hydraulic pump system when lifting.
According to Toyota, this diesel-hybrid forklift will have a 50% better fuel economy and 50% better emissions than a comparable 3.5t diesel forklift, which is pretty decent, if a bit underwhelming.
Electric forklifts probably are greener when they can be used, but when a longer range and operating time is required, a diesel-hybrid probably is the best choice. Depending on the emission control hardware, it might even run on B100 biodiesel.