What is the minimum and maximum installed capacity for each energy source considered?
SELECT ?energy_sources_labels (MIN(?installed_cap_value) AS ?min_installed_cap_value) (MAX(?installed_cap_value) AS ?max_installed_cap_value)
WHERE {
  orkgr:R153801 orkgp:compareContribution ?contrib.
  ?contrib orkgp:P43135 ?energy_sources.
  ?energy_sources rdfs:label ?energy_sources_labels;
                  orkgp:P43133 ?installed_capacity.
  ?installed_capacity orkgp:HAS_VALUE ?value.
  BIND(xsd:float(?value) AS ?installed_cap_value)
}