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Nuclear and data-center power

The 7 companies in this industry listed on the NYSE and Nasdaq are worth $185 bn combined; the largest are Constellation Energy (CEG), Vistra Corp. (VST) and NRG Energy (NRG). For each one: what it does, revenue, margin, free cash flow over the last five years and a score from 0 to 10.

Data as of October 2026

Comfortable leader
7 companies value 185 bn revenue 88 bn margin 7.4% free cash flow 3.4 bn avg. score 2.7
CEG holds 50.3% of the group's value, 1.9x the runner-up
Rank Ticker Company Share Value Revenue Margin FCF 5 years FCF/px Yield What it does · why it is here
1 CEG Constellation Energy
United States · score 3.8
50% 93 bn 31 bn 11.1% 0.3 bn 0.3% 0.6% Nuclear power generation and sales to large customers · Largest US nuclear operator; direct contracts with AI data centers
2 VST Vistra Corp.
United States · score 5.4
27% 50 bn 19 bn 11.6% 2.3 bn 4.5% 0.6% Power generation and retail electricity sales · Major unregulated power generator; leveraged to rising power prices
3 NRG NRG Energy
United States · score 3.1
11% 21 bn 33 bn 2.6% 0.3 bn 1.7% 2.0% Retail power, gas and home services · Unregulated power generator with supply contracts for data centers
4 TLN Talen Energy
United States · score 1.9
9% 17 bn 3.4 bn -5.4% 0.6 bn 3.4% — Independent power generation, including nuclear · Nuclear power with a direct supply contract for an Amazon data center
5 KEN Kenon Holdings Ltd.
Singapore · score 4.4
2% 3.2 bn 0.9 bn 17.0% 0.2 bn 5.2% 8.3% 46% stake in power generation in Israel and the US · Singapore — revenue of $872m
6 HNRG HALLADOR ENERGY CO
United States · score 0.5
0% 0.5 bn 0.5 bn -0.2% -0.1 bn -9.2% — Independent power and coal producer in Indiana · Indiana — revenue of $455m
7 NPWR Net Power Inc.
United States · score 0.0
0% 0.2 bn 0.0 bn — -0.2 bn -73.4% — Developing natural gas power plants in Texas, with carbon capture in later phases · Texas

Other industries in the same sector

What this is. A catalogue, not a guide. Every industry with stocks listed on the NYSE or NASDAQ, the companies contending for its leadership, what each one does according to its own annual report, and the balance sheet it filed with the SEC.

The score runs from 0 to 10 and compares each company with every other one in the almanac on cash generation, profitability, debt, dividends and consistency over the last five years. The higher it is, the better the company fares in that comparison. Curious how much each part weighs? Ask at the bottom of the page.

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