Is it permissible to demand financial compensation for an exercise machine that broke down due to the negligence of the electricity company in maintaining the wires, knowing that the value of the machine is 300 dollars and that the law in America allows this?

If the damage to the machine was due to the company's negligence in having weak or damaged electrical wires, then it is permissible to seek financial compensation, because compensation for damage is established in Islamic law (Sharia). The rule is that whoever damages something is liable for its guarantee. The guarantee is to replace the item with one similar to it, and if that is not possible, then with its value. If the machine can be repaired, the company is obligated to do so; otherwise, it is obligated to purchase a similar one or pay its value. The assessment of the value should be referred to experts.