I'm referring to DL380 G7's power consumption stated as per http://www.hp.com/hpinfo/newsroom/press_kits/2010/breakingthegridlock2010/DL380G7ServerDS.pdf There are different power supply available in this model: 460W; 750W; 1200W In Malaysia, we can safely assume RM0.43/KWH as per http://www.tnb.com.my/business/for-commercial/pricing-tariff.html, Tariff B. So, if we take DL380G7 with 460W, running 24x7, total per server power consumption is 4018.56KWH. Rate per year per server, 4018.56KWH x RM0.43 = RM1272.98. Factoring in the cooling load at 1X (2.0 PUE) puts the annual energy cost per server at RM3,455.96. For 750W, rate per year per server is RM5634.72 For 1200W, rate per year per server is RM9015.55 You probably can take 20%-30% off from the number presented above assuming that these servers are somehow energy saving for best case.
This is meant for educational purpose.