Click here to meet all the people in our new joyful jobs seriesHappiest when ‘nerding out’ about renewable energy systems, Alex Willis is gleeful about having the power to make a difference. His job is helping more people to take a ‘whole home approach’ to green energyAlex Willis – design and technical manager at Good Energy Sub-zero temperatures might give most of us the shivers but for Alex Willis, a design and technical manager at sustainable energy stalwarts Good Energy (GE), a cold spell guarantees a warm, fuzzy feeling. Willis heads up a small team designing heat pump systems, and nothing gives him greater satisfaction than the certain knowledge that GE’s customers are toasty in their cosy homes. He likens the current buzz around heat pumps to the solar PV boom 15 years ago, but – Willis says – this time it’s different. The future is a whole home approach: solar tying into EV charger, storage and heat pump.” he thrills.