Your account is not a bank account that earns interest. It is an account that reflects the value of your ownership in LCEC. Your equity is invested in equipment and facilities such as trucks, poles, transformers, office facilities and lines, which are used to provide electrical service. If LCEC paid interest on each account, rates would increase to cover the additional expenses. Of course these higher rates would be paid by the members of LCEC.
Remember, equity ownership represents a return of some of the money you paid for electricity. It is not a dividend.