import cpw.mods.fml.common.FMLCommonHandler;
import cpw.mods.fml.relauncher.Side;
import me.modforgery.tesla.client.particles.TeslaParticles;

    @Override
    public void updateEntity(){
       super.updateEntity();
        if (FMLCommonHandler.instance().getSide() == Side.CLIENT)
            TeslaParticles.plasa(this.worldObj, this.xCoord + 0.5, this.yCoord + 0.3, this.zCoord + 0.5 , this.xCoord + 0.5 + 10, this.yCoord + 0.3, this.zCoord + 0.5);
    }

import cpw.mods.fml.common.FMLCommonHandler;
import cpw.mods.fml.relauncher.Side;
import me.modforgery.tesla.client.particles.TeslaParticles;

    @Override
    public void updateEntity(){
       super.updateEntity();
        for (int x = -scanRadius; x < scanRadius; x++) {
            for (int y = -scanRadius; y < scanRadius; y++) {
                for (int z = -scanRadius; z < scanRadius; z++) {
                   TileEntity tile = this.worldObj.getTileEntity(this.xCoord + x, this.yCoord + y, this.zCoord + z);
                   if(tile != null && tile instanceof IPoweredTile){
                       if (FMLCommonHandler.instance().getSide() == Side.CLIENT){
                           TeslaParticles.plasa(this.worldObj, this.xCoord + 0.5, this.yCoord + 0.3, this.zCoord + 0.5 , tile.xCoord + 0.5, tile.yCoord + 0.5, tile.zCoord + 0.5);
                       }

                   }
                }
            }
        }
    }

Update TileEntityTeslaCoil.java