Institute of Petroleum
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The Institute of Petroleum had similar goals to the EI but was specifically focused on the oil and gas industry, whereas the EI also covers other forms of energy including nuclear and alternative energies.
The IP designation still survives, for example in the specification of test methods in the petroleum industry (see for example a list of IP Test Methods on Caleb Brett's site). The Energy Institute still runs an "International Petroleum (IP) Week", a series of events and seminars aimed at the petroleum industry.