Is Constellation Energy Stock a Buy Now?

Constellation Energy (NASDAQ: CEG) hails from the utility sector, but it is not a regulated utility business. That changes the equation for investors in a fairly material way. With the stock down around 15% from its 52-week high, is now the time to step aboard this independent power producer?

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What does Constellation Energy do?

Regulated utilities tend to be fairly boring and consistent businesses. They are granted monopolies in the regions they serve, and in exchange, they submit to government oversight of the rates they charge customers and their capital investment plans. The goal of regulators is to strike a balance between costs, reliability, and investor returns. The usual outcome is a slow and steady business that pays an attractive dividend.

Constellation Energy operates outside of the regulated utility model or, perhaps, adjacent to it. It sells power directly to other companies and individuals, charging market-based rates. There is more downside risk in this model but also more upside opportunity. It isn't necessarily better or worse, per se, but it is important to note that Constellation Energy's business model is different from that of a regulated utility.

The company's most notable feature is its large nuclear reactor fleet. It is, in fact, the largest operator of nuclear power in the United States. That said, it also operates natural gas power plants and renewable power assets. On that front, Constellation Energy just completed the acquisition of natural gas-focused Calpine, "creating the nation's largest producer of electricity."

In a world where the demand for electricity is rapidly increasing, Constellation Energy appears to be well positioned. Demand is likely to continue expanding, as well, as technologies like artificial intelligence and electric vehicles gain in importance. That's the good news. The bad news is that Wall Street is well aware of the trends taking shape around electricity.

Even a good company can be a bad investment

It appears as though Constellation Energy is executing well and positioning itself for continued success. However, the stock has increased by 280% over the past three years. The S&P 500 (SNPINDEX: ^GSPC) index is up nearly 75% over that same span. The average utility is up only 20%. That 280% figure, notably, includes the roughly 15% drawdown that has occurred in Constellation Energy since around October 2025.

Since October, Constellation Energy's stock price has materially underperformed relative to both the S&P 500 index and the average utility. This underperformance, however, makes a great deal of sense when you look at the valuation that investors are affording Constellation Energy.

Even after the pullback, Constellation Energy's price-to-earnings ratio (P/E) is nearly 38 times, and its price-to-book value (P/B) ratio is around 7.2 times. The S&P 500 index's P/E ratio is 28 times, and its P/B ratio is 5.2 times. The average utility, using Vanguard Utilities ETF (NYSEMKT: VPU) as a proxy, has a P/E of 22 times and a P/B of 2.4 times. Very clearly, investors continue to price a lot of good news into Constellation Energy's stock.

The premium valuation here is likely emotional and heavily tied to the company's nuclear power segment. The increasing demand for cleaner electricity options has led to a resurgence in nuclear power. Most companies tied to the industry have seen material stock price advances.

The opportunity is real, noting that Constellation Energy is moving to reopen once-shuttered nuclear power plants. However, Wall Street has a tendency to become overly enthusiastic, thereby stretching the valuations of companies that are currently in favor. Given Constellation Energy's lofty valuation, that appears to be what's happened here.

It is probably better to watch from the sidelines

It looks like Constellation Energy has positioned itself well for the future. It also appears that investors have rewarded the company for this, awarding it a lofty valuation. That remains true even after a 15% pullback from the stock's 52-week highs. Most investors will likely be better off keeping this utility business on their watch list for now until its price comes back down to Earth.

Reuben Gregg Brewer has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Constellation Energy. The Motley Fool has a disclosure policy.