NextEra Energy's shares have been on a run, which will materially reduce the attractiveness of the stock for many investors. Over the past three months, the average utility stock in the S&P 500 index has gained around 10% using Utilities Select Sector SPDR ETF as an industry proxy. That compares to a roughly 6% advance for the broader S&P 500 Index. But NextEra Energy (NEE 0.48%) gained more than 20% over the same period, which is nothing short of impressive. Have you missed out? Maybe, but it depends on yo ...