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As per the R&A rules, immovable obstruction is NOT for ball in flight. Therefore, these specific cases like electric pilons, wires across the fairway etc... are generally local club rules. In most of the courses (Like in Hindon, Army golf course etc) ... the local rule is "You take a re shot without penalty, however only in the case of hitting from the fairway".
Your local course or club can enact rules specific to conditions at your course, as long as they do so in accordance with the guidelines set forth in Appendix I (covering Local Rules) to the Rules of Golf which states that the golfer is required to replay the stroke without penalty. There is no golfer's option if the rule is in effect.