Arm, a Nasdaq and London-listed chip maker, and the long-term corporate venturing unit of mutual fund manager Fidelity International have reinvested in UK-based smart grid company Amantys.

Moonray Investors, which invests using Fidelity’s balance sheet to look for long-term investments in clean-tech and healthcare, and Arm invested $8m in Amantys’ series B round, following their $7m investment in July last year.

Intellectual property fund manager IP Group joined Amantys’ founders in a $1m seed round in 2010, news provider EE…