The recalculation of the FTSE 100 share index is expected to see power and energy companies promoted from the FTSE 250, thanks to rising oil and commodity prices.

Drax Group, owner of the Drax power station and energy facility firm Petrofac are expected to be promoted to the top flight share index, reports the BBC.

Among those expected to be relegated from the FTSE 100 to the FTSE 250 are housebuilder Persimmon, Home Retail Group and Tate & Lyle.

Any changes will take effect on 20 June 2008.

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