Energy is fungible. If you increase wind power, that means natural gas is available for running fleet vehicles, buses, etc.... which replaces oil used for those purposes.
We'll also need more power capacity for electric cars and plug in hybrids. So we can either build more natural gas power plants, or more solar power plants. Which would you rather have?
Nuclear power isn't some panacea like a lot of you apparently think. Remember, Mr. Nuclear himself, John McCain, didn't want nuclear waste shipped across Arizona.
You know.. one risk of nuclear power is some future conservative administration relaxing regulations "because the government is evil and private companies can police themselves better", resulting in contamination, meltdown, or improper disposal of waste. Unless we as a nation shift significantly to the left, the less nuclear power there is, the safer our children will be.