How much electricity does mining Malairte use?

It depends entirely on what you mine with and how hard you push it. A CPU-only setup on a laptop or office PC might add only 40 to 90 watts above idle, while a desktop running a power-hungry GPU can add several hundred watts. The only reliable way to know your own figure is to measure it with an inexpensive plug-in power meter at the wall, which shows the real draw under mining load. Once you have the wattage, multiply by your local electricity rate to understand the running cost. You control this number directly: capping the GPU power limit and reducing CPU threads both lower consumption, usually for only a small drop in hashrate.