Portland-based Avangrid Renewables will lease 480 acres of state-owned land near Bickleton in Klickitat County to develop a 150-megawatt solar-energy project.   In announcing the agreement, Washington Commissioner of Public Lands Hilary Franz said it will produce $120,000 a year in new revenue for public education.  Avangrid will lease the land for $300 an acre annually for 40 years, compared to the $2 an acre the state received for grazing.  Avangrid communications manager Paul Copleman says the company wants to have the solar farm operational by the end of 2020.  The lease with DNR is part of 2,200 acres Avangrid is seeking for the project, and it has acquired 1,800 acres of public and private land so far.  Copleman says the company is negotiating with a potential buyer for the power the complex will generate.