The four choices are:

1. Graphene Based Ultracapacitors
2. Urea as a hydrogen carrier for fuel cells or Internal Combustion Engines
3. Rechargeable Metal Air batteries
4. Other - got your own idea

It would be nice if you could also explain why you think that energy storage method is more promising than the rest.
The use of the energy storage is mobile, such as vehicles.

A list of like the top energy sources with fuel cells would be really great.

I am researching on renewable energy.

So far I know Singapore has implemented biomass, solar energy and fuel cells.

The problem that I am facing is that when I search the net for renewable energy, all the information given are not within Singapore region. I need someone to tell me where can I find more information on renewable energy in Singapore.

Do anyone know which companies uses renewable energy? Who can I find to know more about the topic?

Is there any other students doing major project on renewable energy? If yes, email me. I hope to work together to produce good results.

Thanks a Lot!