# Excerpts from registers
Do you want everything spelled out in black and white? Do you want to see information on a map? Then you are in the right place. Most registers fulfil a role of publishing information, documenting, exercising supervision or providing protection. Here you will find contacts and information related to obtaining information and excerpts from registers.To Services
If you want to register as an expert in the energy efficiency expert list, you can submit an application under certain conditions.
When you start a business activity, you will be given a business identification number (W-IdNr.).
As an employer, you must register your employees for social insurance. To do this, you need a company number.
If your employer is insolvent and can no longer pay your wages, you can apply for insolvency benefit.
If you operate an electricity or gas installation and it is connected to an electricity or gas grid, you must register the unit in the Market Master Data Register (MaStR) of the Federal Network Agency. You only have to register plants in planning in certain cases.
If you are a market player in the electricity or gas market, you must register in the Market Master Data Register (MaStR) of the Federal Network Agency.
These Assistance Services support you in exercising your rights and fulfilling your duties in the European internal market.