Scottish Power has completed a deal with Drax Group to sell a portfolio of their assets which include gas, hydro and biomass stations, worth £702 million, leaving the company generating their power purely from wind turbines.
The move comes as part of the company's strategy to invest £5.2 billion in the next four years on renewable energy, improvements to the grid and provision of smart technology to their customers.
The owner of East Anglia ONE 714MW wind farm and almost 3000 MW of offshore wind projects in the pipeline, the company aims to dominate the supply of cheap and clean energy across the UK.
However, the company's five million domestic customers will continue to be supplied with a mix of renewable and conventional energy, as producers using all types of energy generation all feed the UK grid.
The chief executive of Scottish Power, Keith Anderson said: "This is a pivotal shift for Scottish Power as we realise a long-term ambition. We are leaving carbon generation behind for a renewable future powered by cheaper green energy. We have closed coal, sold gas and built enough wind to power 1.2 million homes.
"Every working day we are investing over £4m to deliver cleaner, smarter power for customers. From today we can focus solely on making energy generation cheaper, cutting carbon quicker, building smart grids and connecting customers to renewable electric future for transportation and heating."