By Silas Allen, Staff WriterNORMAN — After four years of drought, water conservation has become essential to keeping Oklahoma energy companies viable, industry officials said Thursday. Industry leaders joined weather forecasters, climatologists and officials from several western states Thursday at the Western Governors’ Association’s drought forum at the National Weather Center in Norman. Discussions about the economic impact of drought tend to focus on sectors like agriculture and municipal water supplies, where demand for water is greater.Read more on NewsOK.com