While the title sounds dry ( regulating electrical sector procedures ), RD 824/2010 is famous — or infamous — for retroactively slashing feed-in tariffs for existing solar PV plants in Spain. It effectively cut guaranteed subsidies for hundreds of thousands of renewable installations that had been built under earlier, more generous rules (RD 661/2007 and RD 1578/2008).
Here’s an interesting angle on (Spain), which is often overlooked outside legal or energy circles: real decreto 824/2010