Business Insider/Toby Melville/Reuters/Corbis/Getty ImagesA new report from consulting firm McKinsey & Co. says that the best energy companies to buy are not those with the highest margins or the highest operating margins, but the ones with the lowest cost-per-kWh.
McKinsey found that the cheapest energy companies were those with a margin of 30 to 50 percent, or lower, and the most cost-effective ones had margins of around 15 to 25 percent.
These are the companies with the biggest cost-competitiveness gaps and the lowest energy prices.
The companies with biggest cost gaps and lowest energy costs include Tesla Motors, Caterpillar, SunPower, and NextEra Energy.
The cheapest energy company was NextEro Energy, which had a margin below 30 percent and a price-per