SAN JOSE, Calif., Feb 11 (Reuters) - Power producer Calpine Corp. (NYSE:CPN - News) said on Tuesday that it had reached deals with its turbine suppliers giving it the option to cancel future orders of $3.4 billion if demand in the depressed industry does not pick up. The San Jose, California-based company said it would record a pretax charge of about $207 million against earnings in the fourth quarter of 2002 for costs associated with the potential cancellation of 87 gas turbines and 44 steam turbines. Calpine has been working to shed assets as it scales back plans for future...