Two buildings in the Commonwealth of Pennsylvania’s state capital, Harrisburg, have been improved to achieve an expected 30 percent energy reduction throughout the combined 750,000 square feet (69675 m2) of the buildings. The project, carried out by Buffalo Grove, Ill.-based Siemens Building Technologies Inc. and Pennsylvania’s Department of General Services, implemented photovoltaic energy systems. The Commonwealth will save the equivalent of nearly $800,000 in energy costs during the first year and that figure will escalate by approximately 5 percent per year thereafter.  Total program energy savings estimates are expected reduce equivalent energy expenses some $15 million over the life of the contract. According to DGS, net energy cost savings to the taxpayers are in excess of $2 million.