Depending on the type of work you do, this one may or may not be possible. But switching from using a desktop to a laptop while at home can help cut down on electricity costs. This is because a desktop generally uses a lot more energy than a laptop. The latter is built to be energy efficient since it has to last so many hours on a single charge as opposed to a desktop that's meant to stay plugged in.
But again, if your work requires a lot of computing power, then you might not have a choice in the matter and you may be forced to stick with using a desktop.