DUBAI (Reuters) - Qatar is considering building one of the world's largest solar power complexes to help meet demand, which could increase four-fold over the next 30 years, the Middle East Economic Digest (MEED) reported. Gulf Arab states have about 30 percent of the world's oil reserves and 8 percent of its gas, but an economic boom spurred by record crude prices is driving demand for power and water so rapidly that many are considering turning to alternative energies including nuclear.