Public Service Enterprise Group Incorporated's (NYSE:PEG) price-to-earnings (or "P/E") ratio of 10.9x might make it look like a buy right now compared to the market in the United States, where around half of the companies have P/E ratios above 17x and even P/E's above 33x are quite common. However, the P/E might be low for a reason and it requires further investigation to determine if it's justified.

Public Service Enterprise Group certainly has been doing a good job lately as its earnings growth has been positive while most other companies have been seeing their earnings go backwards. One possibility is that the P/E is low because investors think the company's earnings are going to fall away like everyone else's soon. If not, then existing shareholders have reason to be quite optimistic about the future direction of the share price.

View our latest analysis for Public Service Enterprise Group

Is There Any Growth For Public Service Enterprise Group?

There's an inherent assumption that a company should underperform the market for P/E ratios like Public Service Enterprise Group's to be considered reasonable.

Taking a look back first, we see that the company grew earnings per share by an impressive 310% last year. The latest three year period has also seen an excellent 48% overall rise in EPS, aided by its short-term performance. Accordingly, shareholders would have probably welcomed those medium-term rates of earnings growth.

Turning to the outlook, the next three years should bring diminished returns, with earnings decreasing 9.4% per annum as estimated by the analysts watching the company. Meanwhile, the broader market is forecast to expand by 13% per year, which paints a poor picture.

In light of this, it's understandable that Public Service Enterprise Group's P/E would sit below the majority of other companies. Nonetheless, there's no guarantee the P/E has reached a floor yet with earnings going in reverse. There's potential for the P/E to fall to even lower levels if the company doesn't improve its profitability.

The Final Word

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 Public Service Enterprise Group maintains its low P/E on the weakness of its forecast for sliding earnings, as expected. At this stage investors feel the potential for an improvement in earnings isn't great enough to justify a higher P/E ratio. Unless these conditions improve, they will continue to form a barrier for the share price around these levels.

You need to take note of risks, for example - Public Service Enterprise Group has 3 warning signs (and 2 which make us uncomfortable) we think you should know about.

You might be able to find a better investment than Public Service Enterprise Group. If you want a selection of possible candidates, check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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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.