Markets EV takes stake in HalfwaveVenture-capital firm Energy Ventures (EV) has announced an investment of more than £7.5million in a pipeline-inspection company. September 4th 2012, 8:36 am 1 min read Facebook An icon of a facebook f logo. LinkedIn An icon of the LinkedIn logo. Twitter An icon of the Twitter logo. Venture-capital firm Energy Ventures (EV) has announced an investment of more than £7.5million in a pipeline-inspection company.