Strong growth in the North American market has helped Centrica increase annual profit by 15%.
Since its demerger from British Gas, the firm has expanded beyond the UK, buying US businesses and becoming a telecoms and customer service provider.
The group revealed full-year profits of £1bn, up from £870m the year before.
While profit in the US more than doubled to £130m, Centrica's British Gas unit was hit by a combination of warm weather and high commodity costs.
Centrica said it had made "steady progress" in 2003, adding that its promising outlook had prompted a 35% rise in its annual dividend to 5.4p a share.
North America led the way , with turnover rising 112% following the first full-year impact of its retail energy acquisitions in Texas.
Good year for AA
British Gas increased turnover by 2.4% to £6.2bn, helped by an increase in its electricity market share, higher prices and growth in its home services business.
But significant increases in commodity and transport costs pushed operating profit 16% lower to £206m.
Elsewhere, the group's AA roadside services and personal finance operation enjoyed a strong year with turnover up almost 5% to £797m and operating profits jumping 27% to £93m.
The firm also said it wanted to expand its gas and power businesses in 2004.
It also plans to invest about £100m a year in increasing gas reserves, in an effort to support UK customer demand.