pocketmine\entity\Creeper::setPowered PHP Method

    public function setPowered(bool $powered, Lightning $lightning = null)
    {
        if ($lightning != null) {
            $powered = true;
            $cause = CreeperPowerEvent::CAUSE_LIGHTNING;
        } else {
            $cause = $powered ? CreeperPowerEvent::CAUSE_SET_ON : CreeperPowerEvent::CAUSE_SET_OFF;
        }
        $this->getLevel()->getServer()->getPluginManager()->callEvent($ev = new CreeperPowerEvent($this, $lightning, $cause));
        if (!$ev->isCancelled()) {
            $this->namedtag->powered = new ByteTag("powered", $powered ? 1 : 0);
            $this->setDataProperty(self::DATA_POWERED, self::DATA_TYPE_BYTE, $powered ? 1 : 0);
        }
    }