Autorità per l'energia elettrica e il gas, Direzione Mercati 20 Setting out PP Every 3 months (end of March, end of June, end of September and end of December) the regulator set out PP t PP t =PP t-1 +ΔPP Where ΔPP=PP 0 x(I t -I t-1 ) and I t is an index calculated on the basis of international oil prices pubblished monthly in Platt's Oilgram Price Report I t = a×GASOLIO t /GASOLIO 0 +b×BTZ t /BTZ 0 +c×BRENT t /BRENT 0 (GASOLIO 0, BTZ 0, BRENT 0 and PP 0 are basis values and a=0,41 b=0,46 c=0,13)
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