The policy instruments include those oriented towards prices and quantities. The former (such as Feed-in Tariffs) provide the supplier with certainty regarding price, but the volume depends on whether that price is high or relatively low. The latter includes renewable portfolio standards that require distribution companies to purchase specific quantities of electricity generated by renewable technologies. In addition, the sector regulator is in a position to give advice to the government regarding the full implications of focusing on climate change or energy security. Policymakers, however, may choose to delegate these decisions, or a subset of them, to regulators; on the other hand, they may choose to remain silent on such issues. In the former case, of course, regulators have the power to exercise their discretion. In the latter case, the scope of regulatory discretion depends on what the legal system provides. In either case, the internal practices followed by the regulator need to provide legitimacy for regulatory rulings related to RE. Such practices include transparency and evidence-based decision-making. Renewable energy lawyers Renewable energy lawyers focus their practice on serving the legal needs of renewable energy project developers and companies that develop clean technologies (see clean tech law). Renewable energy laws by country Germany A chart summarizing German energy legislation is available. Germany is a global leader in renewable energy legislation. To lower carbon emissions, Germany is undergoing an energy transition from things like fossils fuels to renewable energies such as wind power. This transition is known as Energiewende directly translating to 'energy transition'. The process of implementing these Energiewende started in the 1990s and continues to this day. To speed up investment to support Renewable energy systems, feed-in tariffs are put in to place with most offering a long term contract for twenty years. With these feed in tariffs, the primary consumption of energy while using renewable resources has grown from 1.9% in 1995 to 12.6% in 2015. This transition is also heavily supported by the German people; with 92% saying they support implementing more renewable energy systems. One of the most used renewable energy sources used is onshore wind power. Just over 35.5% of electricity from renewable sources comes from onshore wind power and it is claimed to be the most cost efficient renewable source. Switzerland :de:Energiegesetz (Schweiz) Renewable energy laws by technology Renewable energy laws can either be 'technology neutral' or provide specific assistance to particular selected groupings