The Spanish State structure Estado de las Autonomías, a federal structure?

According to article 66.2SC the major functions of parliament are:

• 
  The exertion of the legislative power of the state
  
• 
  Control of the governments actions
  
• 
  The approval of state budgets
  
• 
  The exertion of other powers vested in them by the constitution
  

Congress is considered to have an overall precedence in parliament over the Senate. This clearly stands out in the amount of specific powers attributed to the Congress. An example of this is the exclusive Congressional right to demand information from any institute of public administration. The Senate is restricted to requesting information emanating from bodies within the houses.

• 
  ratification or rejection of governmental decree laws within thirty days (art.87SC)
  
• 
  approval/disapproval of the declaration of a state of alarm, exception or siege (art.116SC)
  
• 
  accusation of the P.M. or other members of the government in case of treason or any other offence against the security of the state (art.102SC)
  
• 
  approval /disapproval of a candidate for the premiership through a vote of investiture (art. 99.3SC)
  
• 
  introduction of a censure motion through which the Congressional distrust in the government can be expressed. This motion also requires Congress to nominate a new candidate P.M. which in order results in the dismissal of the entire government (articles 113SC, 114.2SC and 101.1SC)
  
• 
  expressing of confidence or non-confidence in the P.M. if the latter seeks this through a vote of confidence (art.112SC)