Les panneaux solaires, d’une puissance de 2,5 gigawatts, couvrent désormais 3,8% des besoins en électricité, communique mardi l’association des professionnels de l’énergie solaire Swissolar.
Cela représente une légère augmentation de 0,4% par rapport à 2018. Pour atteindre les objectifs de la Confédération, il faudrait toutefois construire 20 fois plus d’installations solaires.
Plus de grandes installations
La tendance est aux grandes installations. L’installation moyenne produit 22,5 kilowatts, contre 19,4 kW l’année précédente. Avec une performance de 39%, la croissance s’est révélée particulièrement importante sur les bâtiments industriels.
Les capacités de stockage des nouvelles installations ont aussi augmenté de 40%. La mémoire moyenne de stockage s’élevait à 13,5 kilowattheures en 2019 contre 9,1 KWh un an plus tôt. Environ 15% des nouvelles installations photovoltaïques des maisons privées ont été combinées avec un accumulateur, précise encore Swissolar.
Energie solaire thermique en net recul
L’énergie solaire thermique s’est en revanche effondrée. La vente de capteurs pour le chauffage a chuté de 34%.
L’association explique cette baisse par la prédominance des pompes à chaleur dans les nouvelles constructions. En 2019, 24’000 pompes à chaleur ont été installées, soit 9% de plus que l’année précédente. Leur combinaison avec une installation photovoltaïque est techniquement plus facile.
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