Energy Infrastructure Partners (EIP) will boost its shareholding in Plenitude, the renewable energy platform of Italian oil and gas major Eni SpA (<a href="http://https://www.borsaitaliana.it/borsa/azioni/scheda/IT0003132476.html?lang=en" target="_blank">BIT:ENI</a>), by further investing EUR 209 million (USD 223.8m).