The ecological component of HREKO is one of its strongest features. There are 7 m2 of solar panels of which 5 m2 are under direct sunlight when the boat is turned sideways to the sun. They are placed in such a way so that they don't interfere while sailing. The effect of shadows which is almost impossible to eliminate on sailing boats is also minimal. Three wind turbines achieve energy autonomy of the boat, each offering 350 W of potential power supply. The rotor blades can be folded in a neutral position during upwind sailing or when noise is an issue. In favourable conditions HREKO has the capacity to generate approximately 12 kWh of electricity per day from wind and sun. This equals up to 40% of maximum theoretical energy production and 60% of battery capacity maximum. It is sufficient for a 4 hour  voyage on electric drive with a 3kW power output. Apart from wind, the drive system consists of a 10 kW diesel generator and two 5kW electric motors. The thrust of a 10kW electromotor is comparable to that of a 30 hp diesel engine. The boat is suitable to automate; e.g. remote control of electric motors, electric systems for reefing, autopilot, etc. During downwind sailing the output of wind turbines can be used to power the electric motors for extra speed. If however the intention is to charge the batteries, both the wind turbines and the electric motors  can generate electricity through propellers. While sailing upwind, wind turbines can power the one submerged electric motor to eliminate resistance or to assist when tacking.