MGE Energy, Inc.'s (NASDAQ:MGEE) price-to-earnings (or "P/E") ratio of 28.5x might make it look like a strong sell right now compared to the market in the United States, where around half of the companies have P/E ratios below 18x and even P/E's below 10x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so lofty.

We'd have to say that with no tangible growth over the last year, MGE Energy's earnings have been unimpressive. One possibility is that the P/E is high because investors think the benign earnings growth will improve to outperform the broader market in the near future. If not, then existing shareholders may be a little nervous about the viability of the share price.

What Are Growth Metrics Telling Us About The High P/E?

In order to justify its P/E ratio, MGE Energy would need to produce outstanding growth well in excess of the market.

Retrospectively, the last year delivered virtually the same number to the company's bottom line as the year before. Regardless, EPS has managed to lift by a handy 9.6% in aggregate from three years ago, thanks to the earlier period of growth. Therefore, it's fair to say that earnings growth has been inconsistent recently for the company.

Comparing that to the market, which is predicted to deliver 15% growth in the next 12 months, the company's momentum is weaker based on recent medium-term annualised earnings results.

With this information, we find it concerning that MGE Energy is trading at a P/E higher than the market. It seems most investors are ignoring the fairly limited recent growth rates and are hoping for a turnaround in the company's business prospects. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh heavily on the share price eventually.

The Key Takeaway

It's argued the price-to-earnings ratio is an inferior measure of value within certain industries, but it can be a powerful business sentiment indicator.

Our examination of MGE Energy revealed its three-year earnings trends aren't impacting its high P/E anywhere near as much as we would have predicted, given they look worse than current market expectations. Right now we are increasingly uncomfortable with the high P/E as this earnings performance isn't likely to support such positive sentiment for long. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

It's always necessary to consider the ever-present spectre of investment risk. We've identified 2 warning signs with MGE Energy, and understanding these should be part of your investment process.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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