The Bonneville Power Administration (BPA) is increasing the cost of power it sells to Okanogan PUD by approximately $1 million a year.  Effective November 1, 2015, the Cost of Power Adjustment (COPA) will increase from $.0040/kwh to $.0056/kwh. COPA is a separate line on your monthly bill and is calculated by multiplying the number of kilowatt hours (kwh) by the new COPA amount of $.0056. For a residential customer using 500 kwh per month, the increase will total $0.80. A customer using 1,000 kwh per month will see an increase of $1.60.