The commission has not considered any power purchase from Captive Power Plants (CPPs) and has considered entire power purchase from TPC for the period from October 2008 to May 2009. No additional procurement of costly power has been considered from TPC during the monsoon period, July to September 2008. If actual power purchase is required to be undertaken during this period due to system conditions, then the same should be undertaken from the CPPs in Pune, the 36 page order issued on Monday stated.

The MSEDCL had submitted a petition to the MERC on April 17, this year to regularize the additional power purchase from Tata Power Company tied up for the period from April 4 to June 30 this year. The petition had also sought approval for the additional power purchase planned from the period from October2008 to May 2009 for mitigating load shedding in the Pune urban circles. The petition had sought in principle approval for the appointment of TPC limited as interim franchisee.

The MERC has sought to rationalise the methodology of computation of the reliability charge. The computation of energy requirement, power purchase expenses,additional sales, and Reliability Charges have been done for each month separately, and aggregated over the period under consideration, the MERC stated in its order.

For the period from October 1, 2008 to May 31, 2009, the Commission has considered 150 MW of power purchase from TPC for 12 hours daily, as against MSEDCL's revised proposal of a combination of 50 MW from CPPs and 100 MW from TPC, since the economics works out better.

The commission pointed out that MSEDCL had been applying different methodologies while computing the Reliability Charges for different regions such as Pune Urban Circles and Thane, Bhandup, Mulund and Navi Mumbai regions.