(Translated from original letter)

CALVO ENERGÍA, S.A.U.             E15106 CARBALLO – La Coruña – (Spain)

Carballo 26th January 2001

Dear Sir,

Having recently complete 3 operational years of our cogeneration [power] plant, equipped with 2 DEUTZ MWM diesel engines, model 8V 16M-640, producing 6.35 Mwe each, which operate with fuel oil Nº1 and using the “rb bertomeu” additive beco F1/ASF from the beginning of operations in 1998, we reaffirm the valuations reflected in our letter of 1st February 1999 (having then completed the first year of operation) and we continue with the opinion that the continued use of the cited additive beco F1/ASF provides us with certain improvement in the aspects that we commented on:

-      Absence of combustion problems.

-      Absence of corrosion in exhaust valves.

-      Minimal encrustation in the exhaust gas circuit.

-      Very small generation of fuel oil sludge.

Furthermore, upon reaching 3 years in operation, with more than 16,500 working hours in each of the 2 engines, we have also been able to verify the absence of corrosion in turbofans and inlet valves, which we know have been detected in other similar plants with less working hours.

We authorise the use of this letter, for reference purposes.