ことにしています means "doing somehting is my custom", so if you would like to translate, "usually I let companies know ~." For example, 私は毎日この時間に散歩することにしています　is everyday I walk around this time. We use ことにしています for something you do not have to do, but you want to do or just you do. 始めたい means I wanto to start, so in this sentence, the companies they want to start power generation with heat of ground.