USA:

Top three companies in the Independent Power Producers industry with the highest operating margin includes two geothermal energy producers
(Financial News Network Online)

Below is listed the three companies in the Independent Power Producers industry with the highest operating margin. A healthy operating margin is required for a company to pay for its fixed costs and generate cash.

1. Ormat Technologies is highest with an operating margin of 21.8%.
2. AES is next with an operating margin of 21.2%.
3. Calpine with an operating margin of 18.0%.