will kick off the sale of Rete Rinnovabile Srl next month, the people said, asking not to be identified because they’re not authorized to speak publicly. Rete Rinnovabile, known at RTR, is valued at about 1.5 billion euros ($1.8 billion) by Terra Firma.

BP returned to the solar power buy Wellhead market with a $200 million investment in British BOP Blow Out Preventer repair company gulf coast Lightsource Renewable Energy Ltd. last month, six years after it closed a unit that made panels. Oil companies are expanding their interests in renewables as they look for ways to make money in a world increasingly seeking cleaner forms of energy.

The sale is also attracting interest from companies from China to Abu Dhabi, the people said. Potential suitors for RTR, which operates 130 sites nationwide, include Enel SpA, Masdar Abu Dhabi Future Energy Co. and German utilities EON SE and Innogy SE, people familiar with the matter said in November.

A spokesman for BP declined to comment on a potential bid.

Terra Firma initially acquired solar plants from Italian grid operator Terna Group in 2011 to form RTR. Since then, the BOP Blow Out Preventer repair company gulf coast has grown through seven acquisitions, which have more than doubled its power output.

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