AMTE Power has received planning permission to extend its Thurso production facility, upping the rate of batteries being built.
Its half-year financial statement saw turnover of £810,000 - up 31% on the 620,000 made during the same period the previous year - although losses before tax grew to £2.65m, from £1.46m the previous year.
Improved balance sheet strength of £6.26m cash or cash equivalents - up from just £22,000 - should underpin the company's investment phase.