docs: def min_renewable_share(network, snapshots, share=0.72):
      """
      Sets minimal renewable share of generation as extra functionality in LOPF
  
      Parameters
      ----------
      share: float
          Minimal share of renewable generation in p.u.
      """
      renewables = ['wind_onshore', 'wind_offshore',
                    'biomass', 'solar', 'run_of_river']
  
      res = list(network.generators.index[
              network.generators.carrier.isin(renewables)])
  
      total = list(network.generators.index)
      snapshots = network.snapshots
  
      def _rule(m):
          """
          """
          renewable_production = sum(m.generator_p[gen, sn]
                                        for gen
                                        in res
                                        for sn in snapshots)
          total_production = sum(m.generator_p[gen, sn]
                                 for gen in total
                                 for sn in snapshots)
  
          return (renewable_production >= total_production * share)
      network.model.min_renewable_share = Constraint(rule=_rule)