MUMBAI, March 31 -- Adani Green Energy Ltd is turning to external contractors to execute projects, easing its long-held reliance on in-house engineering, procurement and construction (EPC) as it pushes to meet an aggressive expansion target.

The company has tapped at least five contractors over the last six months, including listed firms Larsen & Toubro Ltd, Sterling and Wilson Renewable Energy Ltd, Bondada Engineering Ltd, KPI Green Energy Ltd and privately-held Amara Raja Infra Private Ltd, said a person directly aware of the matter.

The change comes as the company needs to add an average of 7.75 gigawatts (GW) of renewable energy capacity annually over the next four years to reach its goal of 50 GW by March 2030-nearly double the 3.4...