Both Orsted and RWE have revised their annual guidance this week, after both suffered due to lighter winds in the first half of the year. Orsted said wind speeds in the April to June period were “significantly lower than normal” and ranked among the worst three quarters in over more than 20 years. Quarterly wind speeds amounted to an average of 7.8 meters per second across its offshore portfolio, which was lower than the normal wind speeds of 8.6 meters per second it had expected. On Thursday, the company stated that it now expects full-year earnings to be at the lower end of its $2.4 billion to $2.5 billion forecast, assuming wind speeds returned to normal for the rest of…