At $10-million and nearly 7,000 solar panels, it's by far the largest solar highway project in the country.  It's all happening at the Baldock Rest Area on I-5 just south of Wilsonville. Portland General Electric CEO Jim Piro says part of the project cost is offset by BETSY tax credits and other grants. It's expected to go online in January and be able to completely power the rest area with solar power.