The William and Flora Hewlett Foundation makes grants to solve social and environmental problems in the USA and internationally. The Foundation’s grant making for its environmental sub-program in Energy and Climate makes grants to strengthen global climate policy. The Foundation also funds improvements in transportation to reduce air pollution -- focusing on China, Mexico, Brazil, and the USA. Most of Hewlett’s grants are by invitation. However, the Foundation accepts letters of inquiry (LOIs) in certain programs -- including Energy and Climate. LOIs can be submitted at any time.
William and Flora Hewlett Foundation -- Grant Making for Energy and Climate