Pros

Reliable:
Fossil fuels are a source of fuel that is consistent and a good source to depend on.

Inexpensive:
Fossil fuel plants do not take up much resources or money and so, are a cheap way to get energy from.

Cost Effective:
In addition to being cheap, the difference of amount of energy made minus amount of energy needed to run it is high, which makes a good source of energy.

Cons

Non-Renewable:
One day there will be no more fossil fuels. They can not renew themselves and once used are used up completely. Once there will be no more fossil fuels, this way of making energy will be of no use anymore.

Pollution:
When fossil fuels are burned, a harmful emission is released that is harmful to living things such as humans and plants.

Habitat Loss:
When fossil fuel plants are made, the ecosystem that lives there is affected. Animals die from the emissions stated above.

Pros

Cost Effective:
Although it is expensive to make, once it has been built, it can be maintained for a low cost.

Reliable:
Geothermal energy production is constant and dependable. Because of it's renewability, geothermal energy production is reliable.

Renewable:
Geothermal energy is a renewable source due to the fact that the Earth constantly produces heat. Unless the Earth suddenly freezes to the core, geothermal-based energy production is a good source of power.

Cons

Place Specific:
The geothermal plant has to be placed at a particular place where there is sufficent heat closer to the surface.

Waste Heat:
When heat is extracted from the ground, some of that might escape and this heat is pollutive to living individuals

Expensive:
Although it can be maintained for a low cost, the required resources are quite hefty and time consuming to put the pipes that will take in the heat.

Pros

Plentiful:
There is a infinite amount of wind in the world. This makes wind-based energy production a good method.

Renewable:
Because of the Earth's rotation, wind will constantly replenish itself

Cost Effective:
Although pricy, Wind-based energy production will eventually pay for itself

Cons

Unreliable:
Wind is inconsistent and when it does start it lasts for only a day or so making this source not that dependable.

N.I.M.B.Y.:
Although seemingly not dangerous, Wind turbines pose a risk to people under it in the event of a storm. Debates have taken place about if wind turbines produce Carbon Dioxide.

Expensive:
The amount of work and money needed to mount a spinnable turbine onto a secured pole is tremendous.

Pros

Cost Effective:
Nuclear energy, once running, can last for a long time without using a lot of money to maintain.

Powerful:
Splitting/fusing atoms creates a ton of energy that when harvested can yield electricity for cities by itself.

Locatable:
Nuclear energy plants do not depend on the surrounding environment. Nuclear energy requires only a fuel and a place to use it. Where the place is located is of no importance to the fission/splitting/fusing of the fuel.

Cons

Waste Heat:
Although it can provide large amounts of energy, it also produces waste heat that is dangerous for organisms to come in contact with. On the plus side, It can be recycled and reused to make even more energy.

Pollution:
Once the energy is created, the byproduct is nuclear waste. This is highly radioactive and must be disposed of carefully or many could die from its toxicity. Nuclear waste created 1500 years ago is still very radioactive.

N.I.M.B.Y.:
Although it has positive advantages to it, if an accident or malfunction occurs, thousands of lives can be lost. This scares people into not wanting anything to do with nuclear energy plants.

Pros

Powerful:
The force of the water provides a high level of energy production. Especially in places like Niagara Falls or Angel Falls.

Reliable:
The constant and unchanging force of the water provides for a good source of power. The only thing that would stop energy collected through water would either be a very long drought or a dam.

Renewable:
Water isn't going anywhere. Rivers and waterfalls do not dry out easily and only a serious drought can do some damage to it. The constant chain of a process known as the water cycle keeps this from happening.

Cons

Place Specific:
Hydroelectric generators can not be used in a desert or other places without considerable amounts of water flowage. This makes it hard to pinpoint places to put these generators because it has to be constant, fast flowing, good base for the generator and wide enough.

Expensive:
It takes a lot of money to put up a generator for this energy collecting method.

Habitat Loss:
An ecosystem would not do well with a huge concrete/steel building using their water as a source of power. Hydroelectric generators damage the ecosystem nearby and habitats are negatively affected.

Pros

Locatable:
Just about anywhere you can get sun. Places like deserts are more of a hot-spot for lots of sun.

Plentiful:
The sun will stay around for a very long period of time. There will be enough sun for eons on earth. This makes solar energy gathering easy because of the sheer multitude of it.

Renewable:
Due to the hydrogen in it's core, the sun's light will be renewed continuously.

Cons

Expensive:
A solar panel is quite pricey. The required money and materials for the silicone panels is too great compared to its output.

Unreliable:
Solar panels only work when in direct contact with the sun. Cloudy days are the weak point for solar energy production.

Un-powerful:
Solar energy is powerful but alot of that power is lost when converted into watts. Over a long stretch of time, it might produce enough energy to match the cost of the panel but it is too weak to provide energy to large amounts of people.

Pros

Reliable:
Biofuel can be burnt at any time which makes this a constant state of unchanged energy production.

Plentiful:
Items to be burnt include a very wide variety of objects which can all easily be produced.

Renewable:
The necessary burnable items can renewed making it an infinite source of energy.

Cons

Expensive:
The required items to build a biofuel plant is rather expensive because the fire needs to be contained in a manner that maximizes energy production

Greenhouse Gases:
Just like any other fossil fuel, biofuel contributes to global warming when the smoke it produces goes into the atmosphere.

N.I.M.B.Y.:
Not many like be next to a large facility whose only purpose is to burn dead pieces of wood and shrubbery. There are health risks when near factories like this.