Standard Oil Co. sold a solar energy investment.

The company moved to rid itself of a $90-million investment in solar energy, selling its share of a partnership for $12 million worth of Energy Conversion Devices stock, ECD said. Standard Oil acted after announcing last week that it will cut its exploration spending this year to half of the $915 million that it spent in 1985. The $120-million partnership, 51% owned by Standard Oil, was formed in 1981 at the height of the oil crisis to develop and manufacture devices to convert the sun’s energy to electricity.