We're a renewable energy company that takes tangible action to create a world that runs entirely on green energy. Our aim is to develop and deploy market leading green energy solutions that benefit the planet and our customers alike, further driving down the cost of green energy. We develop, build and operate wind farms, bioenergy plants and innovative waste-to-energy solutions, while providing smart energy solutions for our customers.
Over the past 25 years we have established our company as a global leader in offshore wind with a 25 per cent market share. To date we have built enough offshore wind to power 9.5 million people and aim to power 30 million people by 2025. The UK is our biggest market with nine operating offshore wind farms. To date, we've invested over £8bn in offshore wind farms in the UK. We'll be investing at least another £4bn by 2020.
A decade ago, we initiated our transformation from a black to a green energy company. Since then, we've reduced our use of coal by 73% and more than halved our CO2 emissions. We're in the process of converting our coal fired power stations in Denmark to sustainable biomass, and by 2023, we will be completely coal-free and will have reduced our CO2 emissions by 96%. In 2017, we divested our upstream oil and gas business, completing our transformation to become a leading pure play renewables company.
We've pioneered a new innovative waste-to-energy technology, Renescience. This technology converts household waste to energy using an enzyme treatment process. The first one in production is in Northwich, UK.
Ørsted is a leading energy supplier to UK businesses. By helping businesses be smarter with their energy consumption through innovative green energy solutions, we're striving to help build a sustainable energy future for the UK, which will last in the new energy economy of the future.
For our full UK history click here