Why electric generator is attached to LP turbine and not on HP Turbine side?

Not sure I understand your question completely but I will try and explain. One turbine in a power plant contains different stages,typically 1 high pressure turbine stage followed by 3 or 4 low pressure turbine stages. All these stages are on the same turbine shaft and make up the whole "turbine".

The high pressure turbine stage is the first stage because the steam is the hottest and at the highest presssure and the low pressure turbines follow, therefore you could not attach the generator directly to the HP turbine but it doesn't really matter because all stages share a common shaft so the generator is receiving power from all the stages of the turbine combined. More.

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