Ukraine should adopt fair, free, and clear market rules to take advantage of the growing investment boom in renewables, Maxim Timchenko, CEO of DTEK, wrote Monday in a World Economic Forum essay titled: “Ukraine must work with leading nations to build sustainable energy markets.” Worldwide, annual investments in renewables may triple by 2050, from the current level of $300 billion, writes Timchenko, CEO of a company that has invested $1.5 billion over the last three years in wind and solar in Ukraine.