Hi,

With a current of 25mA the power dissipation will be less than 1 watt.

30V AC - 1.2V (rectifier loss) = 28.8V
28.8V x 1.41 = 40.608V DC
40.608V - 5V = 35.608V
35.608V x 0.025A = 0.8902 W

* * *

Not in this project but maybe one day you will need a voltage
regulator with an input voltage up to 60V.

http://www.national.com/pf/LM/LM317HV.html

Best regards,

Luciano