German science and technology company Merck has signed a 12-year virtual power purchase agreement (VPPA) with Enel Green Power for the construction of the Azure Sky wind power and storage project in Texas. Taking on 68MW of the Azure project’s 350 MW of generation capacity, paired with a 137MW battery, Merck is an anchor buyer within the Net Zero Consortium for Buyers, an aggregation of renewable energy off-takers. Merck’s agreement, which it says is among the largest aggregation deals in the world, will deliver Renewable Energy Certificates to match 65% of Merck’s U.S. electricity consumption or 100% of U.S. electricity consumption of the company’s life sciences business.