But Paul Bailey, of lobby group Don't Frack the Bay, who is also the Green Party's Napier spokesman, said he was outraged the session was not open to anyone who wished to attend.
"To claim that the workshop will seek to bring together the key stakeholders and decision-makers in our region's energy networks and then exclude the public in its entirety, is frankly an insult," he said in an email to the council.
"Are we, the ratepayers and citizens of Hawke's Bay, not key stakeholders? Do our opinions or ideas count for nothing?"
Regional council chief executive Liz Lambert said the workshop was an "initial scoping" exercise to look at how the council would later go out to consult "meaningfully" with the public.
Therefore, it was not considered appropriate to open it up to all-comers, she said.
"The idea of this workshop is not to get down to the nitty-gritty around arguments as to whether we should have fracking or not - it's about energy strategies at a much higher level than that."
She said as a result of Mr Bailey raising his concerns with the council, she had invited him to attend the workshop as a representative of Don't Frack the Bay.
However, the council's stance of not inviting the public would not be changed because "we don't have anything to focus on yet", she said.