I do not think there is an industry standard. It would be more a case of a company standard or country standard requirements. I have heard a number of energy directors expressing the target or objective of achieving "negative fuel costs". It seems to me that this corresponds with what you are doing by counting the revenue as "contra expense". I cannot see how a company could achieve negative fuel costs without counting the revenues for burning the alternatives against the traditional fuel costs. Whether this is strictly correct in accounting practice I don't know.

Is it possible to burn an alternative fuel in a white cement kiln which would not reduce the whiteness of the actual cement.

Yes, it is possible to burn alternative fuels in a white cement kiln without affecting the whiteness. Animal fat or tallow would be a good example. It all depends on the trace metal content of the particular alternative fuel.

Our plant is supplied by Polysius with inline calciner. The rated output of the plant was 3000tpd. The original system was designed based using Indian domestic coal. Presently we are operating the plant at 3900tpd and we are also using 65 per cent petcoke and 35 per cent imported coal. At this operating condition, we are facing the problem of very high generation of fine clinker during burning process, resulting in the high clinker temperature causing the problem in roller press operation. In view of above, we are interested to know the reason for the same, along with the corrective measure for the improvement in clinker granulometry.