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On September 21 I wrote that if the initial public offering for battery maker A123 Systems turned hot, it would enable a wave of private companies locked out of the public markets to finally go public. (See .)

Well, the A123 Systems IPO was not just hot. It turned red hot.

The offering priced at $13.50. That was well above its expected range of $10 to $11.50, which, was in turn a big increase from the original projections of $8 to $9.

The stock got that higher pricing even though underwriters had increased the offering size to $28.1 million shares from 25.7 million.

Even that increase in supply wasn’t enough to meet demand, I’d say, because when it finally started trading, shares first changed hands at $17 a share. Shares were trading at $19.90 at 2:14 p.m. (ET) as I wrote this.

If that’s not enough to encourage other companies to test the IPO waters, I don’t know what is.