Solar rooftop developers are increasingly choosing to supply power to customers through open access – locating the solar plant elsewhere – rather than set it up on the premises of their clients.
The common feature is that in both cases the power is supplied through the grid directly, without being routed through a discom. Many rooftop developers are now installing as much capacity for supplying through the open access route as they are on rooftops.With solar tariffs becoming increasingly competitive and more states allowing off-site projects to come up, open access is quickly gaining momentum.
“Open access was always allowed according to the terms of the Electricity Act, but more states are now giving approvals for such access,” said Andrew Hines, co-founder, CleanMax Solar, one of the leading rooftop developers in the country.
The year 2018 saw a sharp spike in the installing of open access capacity, with 1,609 MW being set up against 625 MW in 2017, according to Bridge To India (BTI), a renewable energy consultancy firm.
But industry insiders maintain this was mainly because Karnataka offered a waiver on transmission and wheeling charges for directly supplied solar power in 2017-18. As the waiver was valid only till March 2018, rooftop solar developers rushed to beat the deadline and take advantage of it.
While data is still being collected, BTI estimates that the country installed around 420 MW of open access capacity in 2019, lower even than in 2017. But that was because some sanctioned projects are still being completed. “In Haryana and Maharashtra for example, there are projects which got approvals in 2019 which will be commissioned in 2020,” said Hines. BTI’s open access projection for 2020 is at least 1,000MW.
CleanMax has a total operational capacity of 550MW, out of which it has installed 350MW through open access. Amplus Solar, another leading rooftop developer, has 650MW of projects which are under construction out of which 430MW has been through the open access route. “Both rooftop plants and open access will grow in future but open access will be a substantial part of the capacity addition because the addition can be as large as 100-150MW at a single spot. To achieve the same capacity onrooftops will require doing many more projects,” said Sanjeev Aggarwal, CEO of Amplus Solar.
Thus scaling is easier via the open access route. “Open access allows developers to scale up their business much faster and also arguably has lower offtake risk. In contrast, rooftop solar is constrained by availability of on-site space as well as net metering system size caps,” said Vinay Rustagi, managing director, BTI. For a large consumer, even if they were to use all of their rooftop space, they will be meeting only 10% of their power requirement from that, experts said. Solar panels need plenty of space with 1 MW capacity requiring around six acres.
"Rooftop has been a highly compelling option for corporate consumers for past four to five years and the sector has seen multiple fold growth during this period. Today, open access solar power has also become commercially viable in most states and offers savings of 20-40% per unit," said Anuvrat Joshi, head, business development at Cleantech Solar, another leading developer.
Referred from economic times, 22 Jan 2020.