Specialist infrastructure investor group 3i Infrastructure said the assets in its portfolio continue to perform well operationally and financially, generating good income.Dividends and interest received in the first quarter to 30 June resulted in a cash inflow of £15.2m. At 10 August, the company had cash balances of £296m. Managing partner Cressida Hogg said: "We are confident about the market for infrastructure investment, and continue to build on our attractive pipeline of investment opportunities."