In this paper we obtain the central limit theorems, moderate deviations and the laws of the iterated logarithm for the energy
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Hn=∑1≤jωjωk1{Sj=Sk}
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of the polymer {S1, …, Sn} equipped with random electrical charges {ω1, …, ωn}. Our approach is based on comparison of the moments between Hn and the self-intersection local time
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Qn=∑1≤j1{Sj=Sk}
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run by the d-dimensional random walk {Sk}. As partially needed for our main objective and partially motivated by their independent interest, the central limit theorems and exponential integrability for Qn are also investigated in the case d≥3.