Spanish investment holding company Criteria Caixa said on Tuesday it had raised its stake in Naturgy Energy Group SA (BME:NTGY) to 28.5%, taking advantage of <a href="https://renewablesnow.com/news/blackrocks-gip-to-exit-spains-naturgy-1290684/" target="_blank">the accelerated bookbuild</a> launched by Global Infrastructure Partners (GIP) to sell all its stock in the utility.