Bloomberg Even for wind farms, middle age is a time for nips, tucks and sometimes replacement surgery. At least 600 megawatts of US wind farms have already undergone significant upgrades, primarily in California, and NextEra Energy Inc., the largest producer of North American wind power, said it expects to invest as much as $3 billion to upgrade or replace aging …

Bloomberg After years of being sidelined by New Jersey Governor Chris Christie, wind farm developers are dusting off plans for massive offshore turbines that may someday generate more electricity than a nuclear reactor. Christie, a Republican whose term ends in January, effectively blocked wind farms off his state’s coast by never fully implementing a program that would subsidize the projects. …

Bloomberg China’s push for better air quality is proving a bonanza for global steelmakers. Nippon Steel & Sumitomo Metal Corp., Japan’s biggest producer, enjoyed a nine-fold surge in first-half profit as China’s crackdown on pollution and bloated industrial capacity lifted prices to the highest level in more than five years. Posco, the largest Korean mill, said it expected to reap …