especially active in promoting energy-efficient housing for owner-occupied houses as well as for landlords, both for new houses and refurbishments. Its energy efficiency standards for houses (KfW-60 and KfW-40) have become accepted standards in Germany. Concerning environmental protection, it promotes, among others, photovoltaic energy (solar cells) which has in turn received massive indirect subsidies through feed-in tariffs under the Renewable Energy Law of 2000. It also invests in municipal infrastructure such as public transport and sanitation through a sub-unit called KfW Kommunalbank (KfW municipal bank). More recently (since 2006), it has also engaged in education where it provides student loans. Small and medium enterprises KfW Mittelstandsbank (which roughly translates as KfW small and medium enterprises bank), the second largest business unit of the group, provides assistance to German small and medium enterprises (SMEs) including individual entrepreneurs and start-ups. In addition to loans it also provides equity and mezzanine financing. Its financing totaled €20.4 billion in 2015. KfW has been very active in securitization before this market collapsed during the subprime mortgage crisis. Through securitization it helped commercial banks to transfer risks from their housing and SME portfolios to the capital market. KfW also provides loans to European commercial banks to help them finance SMEs, housing and infrastructure (so-called global loans). Development aid KfW Entwicklungsbank (KfW Development Bank) provides financing to governments, public enterprises and commercial banks engaged in microfinance and SME promotion in developing countries. It does so through loans close to market terms using its own resources ("promotional loans"), soft loans that blend KfW resources with support from the federal government's aid budget ("development loans"), as well as highly subsidized loans and grants, the latter two coming entirely from the federal aid budget. Different country groups are offered different financing conditions depending mainly on their per capita income. All these financing instruments are part of what is officially called development cooperation and is more commonly called "development aid". In German aid, the work of KfW Development Bank is called "financial cooperation" which is complemented by "technical cooperation" by GIZ and other public agencies. The main sectors of financial cooperation are water supply and sanitation, renewable energy and energy efficiency, as well as the development of the financial sector. KfW Development Bank also works, among other sectors, in health, education, agriculture, forestry, solid waste management. It provided €7.4 billion in loans and grants in 2014. Export and project finance The