In 2023, the cumulative installed capacity of on-grid solar power systems was 5,021.09 MW, a 502.61 MW increase from 2022, representing a 11.12% growth. This can be categorized into 3,153.70 MW ground-mounted systems (62.81%), which represented the largest share, 1,775.19 MW rooftop systems (35.35%), and 92.20 MW floating systems (1.84%).

        Comparing to 2022, solar rooftop exhibited the highest growth, which increased 427.86 MW (31.76%) followed by ground-mounted system, with an increase of 72.50 MW (2.35%), and floating system, with an increase of 2.24 MW (2.49%) (Table 1.4).

        In 2023, Thailand’s cumulative installed capacity of grid-connected solar power systems with PPA that had already COD reached 3,229.08 MW. Of this number, ground-mounted systems contributed the largest share at 2,987.08 MW (92.51%), followed by rooftop system, which accounted for 194.00 MW (6.00%), and floating systems represented 48 MW (1.49%).

        Comparing with 2022, ground-mounted installations increased by 51.20 MW, representing a 1.74% growth. Rooftop systems expanded by 35.86 MW, showing a 22.68% increase. No new floating solar installation was added in 2023 (Table 1.5).

        In 2023, Thailand’s cumulative installed capacity of grid-connected solar power systems without PPA reached 1,792.01 MW, which can be also characterized into three categories: rooftop installations, which constituted the largest segment with 1,581.19 MW (88.24%), ground-mounted systems, which exhibited 166.62 MW (9.30%), and floating systems, which accounted for 44.20 MW (2.46%).

        When comparing with 2022, rooftop systems showed a 392.00 MW increase by 32.96%, while ground-mounted by 21.30 MW, (14.66%), and floating systems by 2.24 MW by 5.34% (Table 1.6).