It's not a stretch to say that OGE Energy Corp.'s (NYSE:OGE) price-to-earnings (or "P/E") ratio of 16.8x right now seems quite "middle-of-the-road" compared to the market in the United States, where the median P/E ratio is around 17x. While this might not raise any eyebrows, if the P/E ratio is not justified investors could be missing out on a potential opportunity or ignoring looming disappointment.

With earnings that are retreating more than the market's of late, OGE Energy has been very sluggish. It might be that many expect the dismal earnings performance to revert back to market averages soon, which has kept the P/E from falling. You'd much rather the company wasn't bleeding earnings if you still believe in the business. Or at the very least, you'd be hoping it doesn't keep underperforming if your plan is to pick up some stock while it's not in favour.

See our latest analysis for OGE Energy

Is There Some Growth For OGE Energy?

There's an inherent assumption that a company should be matching the market for P/E ratios like OGE Energy's to be considered reasonable.

Taking a look back first, the company's earnings per share growth last year wasn't something to get excited about as it posted a disappointing decline of 55%. Unfortunately, that's brought it right back to where it started three years ago with EPS growth being virtually non-existent overall during that time. So it appears to us that the company has had a mixed result in terms of growing earnings over that time.

Turning to the outlook, the next three years should generate growth of 4.1% each year as estimated by the six analysts watching the company. That's shaping up to be materially lower than the 13% per year growth forecast for the broader market.

With this information, we find it interesting that OGE Energy is trading at a fairly similar P/E to the market. It seems most investors are ignoring the fairly limited growth expectations and are willing to pay up for exposure to the stock. Maintaining these prices will be difficult to achieve as this level of earnings growth is likely to weigh down the shares eventually.

The Key Takeaway

Using the price-to-earnings ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

We've established that OGE Energy currently trades on a higher than expected P/E since its forecast growth is lower than the wider market. When we see a weak earnings outlook with slower than market growth, we suspect the share price is at risk of declining, sending the moderate P/E lower. Unless these conditions improve, it's challenging to accept these prices as being reasonable.

You should always think about risks. Case in point, we've spotted 3 warning signs for OGE Energy you should be aware of, and 1 of them doesn't sit too well with us.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.