Technological change has many facets. The technological change includes, as well as the creation of new products, quality improvement and efficiency gains for existing products. Cars, lighting, computers, software - these and in fact nearly all products have been improving in quality while their manufacturing costs remain constant or decreasing; the economy is improving. Knowledge diffuses across countries and regions, between industries and companies, across universities and researchers. Power to gas is a technology that converts electrical power to a gas fuel. When using surplus power from wind generation, the concept is sometimes called winds. There are currently three methods in use; all use electricity to split water into hydrogen and oxygen by means of electrolysis. Power-to-gas systems may be deployed as adjuncts to wind parks or solar-electric generation. The excess power or off-peak power generated by wind generators or solar arrays may then be used at a later time for load balancing in the energy grid. The Power-to-Gas process chain could play a significant role in the future energy system. Renewable electric energy can be transformed into storable methane via electrolysis and subsequent methanation.