Public Investment in Energy Efficiency Public Investment in Energy Efficiency (PIE) is a SDC and GIZ co-financed pilot project running from January 2014 to December 2016 (Phase-1). PIE will demonstrate how newly decentralized public funds can be utilized for much-needed investments in energy efficiency of public buildings in two remote western provinces of Mongolia. The project will empower the local population to actively participate in planning and budgeting of priority investments, which will result in improved well being and living standards for rural citizens.