California Power-Buying Data Disclosed in Misdirected E-Mail By Daniel Taub  Sacramento, California, July 6 (Bloomberg) -- California Governor Gray Davis's office released data on the state's purchases in the spot electricity market -- information Davis has been trying to keep secret -- through a misdirected e-mail.  The e-mail, containing data on California's power purchases yesterday, was intended for members of the governor's staff, said Davis spokesman Steve Maviglio. It was accidentally sent to some reporters on the office's press list, he said.  Davis is fighting disclosure of state power purchases, saying it would compromise negotiations for future contracts. This week, Davis appealed a state judge's order to release spot-market invoices, purchase orders and confirmation sheets for power contracts signed through June 27. The state is buying electricity on behalf of utilities, which are burdened by debt.  ``It's an internal document,'' Maviglio said of the e-mail. ``We have a meeting every morning where we discuss issues of the day.'' The e-mail contained minutes of today's meeting, he said.  According to the e-mail, the state bought 283,000 megawatt- hours of electricity for $37.4 million yesterday. One megawatt- hour is enough electricity to light 750 typical California homes for an hour. Prices ranged from $25 to $149.99 a megawatt-hour. Maviglio said the information in the e-mail is accurate.  Power for next-day delivery during peak-use hours averaged $79.67 a megawatt-hour on the California-Oregon border yesterday, according to Bloomberg Energy Service. California paid an average of $132 on the spot market, according to the e-mail. Prices on the spot market tend to be higher than on the day-ahead market.  The governor has proposed releasing data on spot-market purchases once a quarter, arguing that the state uses power-buying strategies tailored to each season. Lawyers for the media and Republican legislators say state law requires disclosure of contracts within seven days after they are signed.