It also comes as electricity prices rose due to supply shortages.
The company, which favoured Britain to remain in the European Union due to benefits to energy consumers, said its UK transmission business contributed 1.37 billion pounds to the group operating profit.
National Grid's shares rose as much as 1.6 percent to a more than seven-month high in morning trading on the London Stock Exchange.
Adjusted operating profit rose to 4.7 billion pounds ($6.08 billion) for the year ended March 31, the company said, adding that "favourable timing" in the UK and U.S. businesses, helped in part by the weather, also boosted the earnings.
Total capital investment across the group rose 504 million pounds to 4.45 billion pounds from the prior year, an increase of 5 percent at constant currency.
The Warwick-based company raised its dividend by 2.1 percent to 44.27 pence. The company will maintain its policy of increasing the dividend by at least as much as the UK inflation rate.
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