The Northeast blackout caused cooling problems in the computer systems at the American Stock Exchange that prevented it from reopening until 3:45 p.m. Friday, Dow Jones Reports. As a result, Barclays Global Investors – which with 78 exchange-traded funds on the exchange is one of the biggest sponsors of ETFs – saw its trading volume at only one-quarter capacity. With the delay giving the exchange less than one-half hour for trading Friday (the exchange closes at 4:10 p.m.) Barclays was able to achieve even one-quarter its usual trading volume by using alternative trading systems, like electronic crossing networks (ECNs). Forty-eight of Barclays’ ETFs trade on ECNs.

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