Aggregated Micro Power Holdings' group revenues increased to £19.7m in the year to the end of March (£1.3m for the 15 months to 31 March 2016).
AMP also announced today that it had subscribed £500,000 for new ordinary shares in Highland Wood Energy Limited equating to 50.1% of that company's issued share capital.
Gross profit for the year to the end of March increased to £5.5m (£0.01m for the 15 months to 31 March 2016).
Profit from operations increased to £1.85m (loss of £7.7m for the 15 months to 31 March 2016).
Profit before tax increased to £0.93m (loss of £7.6m for the 15 months to 31 March 2016).
Chief executive Richard Burrell said: "I am delighted to report a very strong set of full year results for AMP.
"The acquisition of three fuels businesses, which will see further turnover growth next year reflecting a full year's trading, has made for a transformational year at AMP.
"Today's acquisition of a 50.1% stake in Highland Wood Energy strengthens our presence in Scotland and enhances our service and maintenance expertise across the UK.
"At the same time, assets under management have grown to £66m comprising operational boilers, in-development peaking plant assets and other biomass assets on long term contracts.
"AMP has a growing pipeline of new project developments which should continue to generate upfront development fees as well as deferred development fees in subsequent years and hence we look forward to the future with confidence."
At 9:46am: (LON:AMPH) Aggregated Micro Power Holdings Plc share price was +10.5p at 112.5p