MADRID, March 21 (Reuters) - Spanish renewable energy giant Iberdrola said on Thursday that it plans to invest 41 billion euros ($44.83 billion) in the next three years, the majority on power grids.

Overall net investments for the company will stand at 36 billion euros, since around 5 billion euros will come from partners.

Europe's largest utility by market cap will pour 21.5 billion euros into its network business, or around 60% of net investments. Renewables will get some 15.5 billion euros, including 5 billion euros coming from partners. ($1 = 0.9145 euros) (Reporting by Pietro Lombardi Editing by Emma Pinedo)