CEG vs ES: How Constellation Energy and Eversource Energy Compare (2026)

Same yardstick, side by side (as of July 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

Reading it: ES is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. CEG and ES share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined CEG and ES exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Constellation Energy (CEG) is the largest producer of carbon-free electricity in the United States, operating the country's biggest fleet of nuclear power plants alongside hydro, wind, and solar assets. Spun off from Exelon in 2022, it generates and sells power and provides energy services to commercial, industrial, government, and residential customers. Constellation's nuclear fleet produces large, steady volumes of around-the-clock, low-carbon electricity, which has become increasingly valuable as datacenters, electrification, and AI computing drive up demand for reliable clean power. The company has pursued long-term power-supply agreements with large energy buyers, including technology companies seeking carbon-free electricity for datacenters, and announced an agreement to acquire Calpine, a major natural-gas and geothermal generator, to broaden its generation mix. Headquartered in Baltimore, Maryland, Constellation benefits from federal clean-energy incentives, including production tax-credit support for existing nuclear plants.

Full CEG guide

Eversource Energy is a public utility holding company that delivers electricity and natural gas to roughly 4 million customers across Connecticut, Massachusetts, and New Hampshire. Its earnings come almost entirely from regulated electric distribution, electric transmission, and gas distribution, where allowed returns and rate base (the capital investment regulators let it earn on) drive results. After several turbulent years, the company completed its exit from offshore wind in 2024 and closed the ~$2.4 billion sale of its Aquarion Water business in mid-2026, repositioning itself as a pure-play regulated utility focused on wires and pipes.

Full ES guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• CEG drivers: Datacenter and AI power demand; Nuclear fleet value and clean-energy support.
• ES drivers: Rate-base growth from a large capital plan; Simplified pure-play regulated profile.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: Constellation has merchant exposure, so its results depend partly on wholesale power and commodity prices, which can be volatile. For ES, regulatory outcomes are the central risk: a FERC reduction to the base transmission ROE is expected to lower after-tax earnings by roughly $70 million in 2026 and contributed to a downward revision of full-year guidance.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick CEG if you believe its drivers more; ES if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the CEG and ES guides.

CEG. Constellation trades at a higher multiple than most regulated utilities because investors price in growth from AI and datacenter power demand and the premium value of carbon-free baseload generation. That re-rating embeds optimism about long-term clean-power contracts; the multiple can compress if power-demand growth or policy support disappoints. All figures are approximate and move with power prices and the share price; verify current numbers before relying on them.

ES. Eversource beat Q1 2026 estimates with revenue of about $4.5 billion and non-GAAP EPS of $1.73, but trimmed full-year non-GAAP guidance to roughly $4.57 to $4.72 (from $4.80 to $4.95) to reflect the FERC ROE reduction and the loss of Aquarion earnings. The valuation, a P/E in the mid-teens and a yield above 4 percent, is typical for a regulated utility where the stock trades on rate-base growth and interest rates more than on quarterly momentum.

Headline figures (approximate, early 2026): CEG shows revenue (ttm) ~$23-25 billion (approximate, verify), position Largest US producer of carbon-free electricity, fleet Largest US nuclear fleet plus hydro, wind, solar, p/e (ttm) ~25-30x or higher (approximate, verify); ES shows revenue (ttm) ~$12.5B, market cap ~$25B, 2026 non-gaap eps guidance ~$4.57 to $4.72, long-term eps growth target ~5 to 7% through 2030.

CEG and ES are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined CEG and ES exposure against your real portfolio. It is not an investment adviser.