The fact that a home has been relying on the electrical grid for many years isn't a sign that a greener alternative isn't possible. The homes are often retrofitted to use solar energy and less on grid electricity when owners choose to do so.
There are also very easy inexpensive ways to include solar illumination systems into the mix while having the assurance of grid based electricity available.
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Solar power and lighting systems have made significant progress over the last few years. What would have taken the form of a solar array to generate can now be accomplished with just the use of a few panels that act as absorbers for sunlight's energy.
Although not every home's configuration is ideal for an upgraded solar system to remove the home from the grid, completely small solar accent lighting is available.
Homeowners who would like to depend more on the pure sunlight's energy as opposed to the grid could consider such options as the solar panels should be strategically placed as well as an inverter and battery storage systems are required to be included in the home's design in order to supply the energy needed for day-to-day usage.
Existing homes that are on tiny areas of land can be greener due to the solar-powered lighting system. There's no reason for you to believe simply because a house is in place and doesn't possess an extensive land area that access to this energy source is not possible.