Genex Power Ltd (<a href="https://www.asx.com.au/markets/company/GNX" target="_blank">ASX:GNX</a>) disclosed on Monday that it has attracted an AUD-381-million (USD 247.6m/EUR 229.0m) takeover proposal from Japanese utility Electric Power Development Co Ltd (TYO:9513), or J-Power, with the news sending shares in the Australian renewables and energy storage firm soaring on Monday.