I. – Variable interest rates on loans taken out by local authorities, their groupings and the departmental fire and rescue services mentioned in 2° of I of article L. 1611-3-1 with credit institutions are indexed or vary according to one of the following indices:
1° A customary rate on the eurozone interbank market, the eurozone money market or bonds issued by a Member State of the European Union whose currency is the euro;
2° The general price level index or the harmonised consumer price index for the eurozone, referred to in article D. 112-1 of the Monetary and Financial Code;
3° An index representative of the price of an exchange of rates between customary rates of different maturities on the interbank or money market in the eurozone;
4° The interest rates on passbook savings accounts defined in articles L. 221-1 , L. 221-13 and L. 221-27 of the Monetary and Financial Code.
II. – The indexation formula for variable interest rates on loans taken out by local authorities, their groupings and departmental fire and rescue services with credit institutions referred to in 3° of I of Article L. 1611-3-1 guarantees that the interest rate payable complies with at least one of the characteristics set out below:
1° The interest rate is defined, at each maturity, either as a fixed rate or as the sum of an index mentioned in I and a fixed margin expressed in percentage points;
2° The interest rate may not, during the life of the loan, become more than double the lowest rate recorded in the first three years of the life of the loan.