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I thought it was interesting to calculate the pollution of the Electric furnace and Steel furnace and see which one creates more pollution. I have used 100% steam based electricity generation for the calculation.

Some pollution calculations (all pollution is per tic)
Pollution boiler

• Pollution boiler at full power - 6
• Full power boiler - 390kW
• Pollution per KW Boiler - 0,0154/KW

edit: However as lxl said the coal needed for the boiler also gives pollution.

Pollution coal mining

• Boiler - 390kW
• Boiller eff - 0,5
• Boiler input - 780kW
• Coal energy - 8000kJ
• Speed req coal - 0,0975 coal/sec
• Drill - 90kW
• Poll per tic - 9
• Speed - 0,5 coal/sec
• % output mine for boiler -19.5%
• % output mine for kw power - 0,05%
  
  So the pollution from mining
• Pollution mining per KW- 0,0045/KW
• Pollution mining electricity per KW- 0,000693/KW
• Pollution mining total per KW - 0,0052/KW

Direct pollution electric furnace

• Pollution Electric furnace - 0,9
• Pollution Electric furnace per KW - 0,005/KW

Total pollution electric furnace

• Pollution Total Electric furnace per KW- 0,0256/KW
• Pollution Total Electric furnace- 4,61

Steel furnace

• Pollution steel furnace per KW- 0,02/KW
Pollution coal mining is half of electric furnace since the steel furnace is 100% efficient
• Pollution mining per KW - 0,0026/KW
• Pollution total steel furnace per KW - 0,0226/KW
• Pollution full power - 4,068

They have the same production speed, so with 100% steam generated electricity the steel furnaces generated less pollution then the electric ones.
One level 1 efficiency module for the electric furnace will reduce all the pollution with 30% giving 4,61*0.7=3,27, so 1 efficiency module is enough for the electric furnace to be less polluting than the steel furnace.

sebas wrote:[...]since it's no longer possible to use energy saving modules in electric furnaces.

It is, just, a bug prevents you from manually slotting them in. If you ctrl- or shift-click with a stack of modules in hand it works.