If after installing solar panels you find that you are producing more energy than you need, you can sell the extra energy that you produce back to the electric company. This method will help you recoup the cost of your solar energy system's installation and parts. Additionally, after you have recovered your costs, you will be making a profit.
Carefully consider the types of solar panels you plan on having installed. Long ago, if you didn't have enough roof space, you'd need very expensive high efficiency mono-crystalline panels. There are now more advanced polycrystalline panels and even thin film panels. If you've got enough roof space, you might wish to look at the size of the panels in relation to their output capacity to avoid having insufficient panels that you need more of later.
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If you are concerned about the environment, solar energy is the smart choice for you. The sun is a renewable resource, so you are not deteriorating the environment. Do your part to use less fossil fuels by using solar energy instead.