Vertical take-off aircraft safety certification acceptance to streamline commercialisation

Move is second phase in three-stage development contract in the country

Berkshire Hathaway way increase holdings to 9.9%

Bids for Mainstream could see the business valued at up to €1bn

Eddie O'Connor's wind and solar energy group valued up to €1bn

Eddie O’Connor owns 55% of company

Renewables group plans multibillion dollar, multigigawatt construction programme

Energy from projects due to come on stream from 2021 after record fundraising

Mainstream has raised over €1.8bn in project finance and employs 200 staff in four continents

Green energy entrepreneur’s firm bought back shares first sold for finance in 2008

Company has Chilean government contracts to develop and run wind and solar plants

225MW farm to supply about 10 per cent of electricity generated in Ghana

Study suggests Ireland would need to exceed current wind energy generation targets

Irish corporate deal volume and values fell in the first nine months of 2013