I estimate that General Electric Company's (NYSE: GE) Infrastructure segment is worth $154.6 billion.

GE's Infrastructure segment, which constituted 29.0%, 28.3% and 27.8% of GE's consolidated revenues in 2006, 2005 and 2004, respectively produces, sells, finances and services equipment for the air transportation and energy generation industries. It also produces, sells and services equipment for the rail transportation and water treatment industries.

GE Infrastructure is really the jewel in the GE crown. Its profits were up 23% in the second quarter. Demand for these products is very high as developing countries with huge cash balances upgrade their infrastructures. While I am not sure how big their budgets are likely to be over the next five to 10 years or whether the price of oil -- needed to fuel those budgets -- will stay as high as it is now, GE Infrastructure looks like a leader in an industry with great profit potential.

Assuming that GE Infrastructure generates net income of $8 billion in 2007, there is one comparable company, United Technologies Corp. (NYSE: UTX) which has a P/E of 19.4. Applying UTX's P/E to GE Infrastructure's earnings forecast yields an estimated value of $154.6 billion.

I would rather have a range of comparable companies, so I welcome suggestions for other publicly traded firms to use as a benchmark.

Next: Breaking Down GE Commercial Finance

Peter Cohan is president of Peter S. Cohan & Associates, a management consulting and venture capital firm. He also teaches management at Babson College and edits The Cohan Letter. He owns General Electric shares and has no financial interest in the other securities mentioned in this post.