41.   But plain old gasoline is likely to be the cheapest power source.

42.   But she is on the mark about the portability of the sun as a power source.

43.   But this team needs to look to a new leader, a new power source.

44.   But unlike California, the other states say they have held on to their regulatory power, while ensuring adequate outside power sources should the market tighten.

45.   But while fuel cells may never be more than a backup power source, in a few cases they play a much bigger role.

46.   But with two power sources and high development costs, a hybrid car may ultimately cost more to buy.

47.   California already has decided three companies are entitled to full recovery of their investments in power sources.

48.   Carrier hotels have unusual operational requirements, including multiple power sources, numerous ventilation outlets and floors capable of bearing heavy loads.

49.   Conveniently, recharging the power source requires only a simple switch of fuel cartridges.

50.   Despite such precautions, many people are taking no chances on having a reliable power source.