Sam Laidlaw, chief executive, said Centrica was planning on investing £15 billion in energy-saving infrastructure between now and 2020, as well as fresh investment in the production and storage of natural gas.
He added that gas price volatility is "one of the reasons we would like to have more sources of energy under our own control - to reduce volatility in earnings and exposure to the volatile wholesale [energy] market".
Centrica has acquired a controlling stake in a project that will see the development of the UK's second-largest gas storage facility.
The facility, which will be located in the Baird gas field in the southern North Sea, is expected to attract a total investment of around £1.2 billion.
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