Power firm Conergy is to build two new solar farms.
The Hamburg company, which has offices in Milton Keynes, announced plans to develop projects at Hendai Farm in the Welsh valleys and Winnards Perch in Cornwall
Together, the plants are expected to avoid 200,000 tonnes of CO2 emissions over the next 25 years.
At Hendai Farm,a former coalmine site will be used for a solar farm that will produce enough electricity to meet the needs of 2,400 homes.
The second site at Winnards Perch, near Newquay, will house a 4.5MWp solar plant capable of powering 800 homes.
Both projects will be completed this year.
Conergy UK and Ireland managing director Robert Goss said: “Coal powered Britain for over 100 years and whole communities grew up around it.
“Solar is a simple technology, lasts for decades and can be deployed wherever people live. No one needs to get their hands dirty or risk their life so that others can turn on the dishwasher, which is why solar will continue to grow in the UK.”