In January, Siemens signed a memorandum of understanding with Associated British Ports to build Green Port Hull development at Alexandra Dock.
The plant, which is located on England's north-east coast, would serve Siemens Round 3 offshore commitments. Alongside Mainstream Renewables, Siemens is a partner in the 4GW Hornsea zone in the North Sea.
In addition, Cameron said at Prime Minister's Question Time that the UK government planned to continue investing in the development of ports for offshore wind.
In reply to a question from the MP for Hull, Cameron said: "I think it is vital for the future of our economy and the future of the area that she represents.
"I met members of parliament from Humberside to discuss the issue. I have spoken to the head of Siemens about the importance of this investment going ahead.
"We are continuing the extra money going into ports to help the development of this industry and we back it all the way."
MOUs have been signed by wind developers and manufacturers and a number of UK ports, including Vestas at Sheerness and Dong at Belfast.
