Possible Clues:

• When you lose energy, expect blackouts with this
• Look of annoyance about team going over current failure
• Example of strike action is energy sapping
• Energy-saving tactic
• Energy being interrupted, might stop filming
• Work group withdrawing in sullenness produces blackout
• Go-getter's hairstyle? Now, it's all off
• Impromptu crew operate lifting boxes in black out
• Sulk about gang turning up when it gets dark?
• Place in which old band recalled problem for the lighting experts?