The German manufacturer said that it has consulted with the site owner, Associated British Ports, and has agreed that it will develop a "leaner, more efficient wind turbine blade manufacturing facility".
But while there will be an increase in output from the initially proposed 450 blades a year to 600 a year, there will not be an increase in jobs or investment. The plans still involve employing 1,000 people, through a £310 million (EUR 388 million) investment.
Siemens has now submitted the revised proposal — which includes the consolidation of the two planned sites into one space — to the consenting authorities.
"The previous plan was driven by the size of factory needed to build, transport and store blades at least 75-metres long. The idea of being on one site was always preferred, but before a recent redesign there was just not quite enough space. However by developing the production concept, the blade factory footprint has been reduced, whilst increasing production output," Siemens said in a statement.
Being on one site should help to lower costs, the company said. Siemens will now be able to produce enough blades to target exports to other European countries.
Work has already begun on Alexandra Dock, preparing the area for the building of the new facilities.