Renewable energy is a multi-billion-pound industry for Scotland supporting tens of thousands of jobs.
However, a trade body for the sector says "much more robust" data collection is urgently needed to understand how the industry is performing and evolving across the UK.
Scottish Renewables is now urging the UK and Scottish governments to develop stronger data on the sector.
New figures out this week show that Scotland's renewable energy industry and its supply chain supported more than 27,000 full-time equivalent jobs and generated £5.6billion of output in 2020.
The Fraser of Allander Institute found that onshore wind supported the most employment across the economy.
It provided 10,120 full-time equivalent roles, followed by offshore wind 6,735 roles and hydro power with 4,395.
Onshore wind generated most money
Onshore wind had the largest output, generating nearly £2.5billion, with offshore wind and hydro power both supporting more than £1.1billion output.
The Glasgow-based institute said that, with the renewable energy sector not currently defined in national statistics published by either the UK or Scottish governments, the size of the sector was estimated using data published by the Office for National Statistics.
Using the latest available data from 2020, the report assesses the impact of the renewable energy sector and its spill-over impacts on Scotland's supply chain and economy.
Claire Mack, chief executive at Scottish Renewables, said: "The renewable energy sector in Scotland continues to go from strength to strength and this report from the Fraser of Allander Institute gives us an encouraging sign of how much the Scottish economy is benefiting from the work our members are doing as we transition to a fossil fuel-free future.
"As an industry, we want to demonstrate how we are adding to the UK and Scottish economy and we want to be able to track how well we are progressing with the transition to a cleaner, cheaper and more resilient energy system in the UK.
"We urgently need much more robust data collection to understand how the renewable energy industry is performing and evolving across the UK. Scottish Renewables urges the UK and Scottish governments to develop stronger data on the renewable energy sector.
Support transparency
"This will support transparency and accountability for government and industry economic and environmental targets."
James Black, a fellow at the Fraser of Allander Institute, said: "This report demonstrates the significant contribution that renewables make to Scotland's economy.
"While the industry clearly plays a critical role in progress towards net-zero targets, it also provides many economic opportunities for Scotland.
"These opportunities include the potential for technological development, new export markets, and prosperity for rural parts of Scotland that may otherwise be economically left behind.
"However, opportunities do not provide prosperity in themselves.
"To ensure that Scotland makes the most of its renewable potential it is important that government and industry can adequately measure whether progress is being made."