The Scottish Government has been accused of using the SNP's majority in Holyrood to close down debate on the security of Scotland's energy supply in the event of independence.
Opposition parties also accused the SNP administration of using planning laws to overturn local democratic decisions during a debate on renewable energy targets.
Labour energy spokeswoman Rhoda Grant suggested the Government has compelled SNP MSPs to use their majority on Holyrood's Economy, Energy and Tourism Committee (EETC) to "close down questioning" on the issue of independence and energy.
Conservative energy spokeswoman Mary Scanlon said a "lack of local democracy" in the planning process is the most frequent complaint she hears about the Government's energy policy.
Energy minister Fergus Ewing said that where the Scottish Government is the decision-taker on renewables applications, it would only approve "the right developments in the right places".
Mike McKenzie, one of five SNP MSPs on the EETC, said those who are sceptical about post-independence energy security are "just scaremongering with a political agenda". But Ms Grant said stakeholders such as energy firm SSE, who said independence represents an "additional risk" to the industry, cannot be dismissed as "political scaremongers".
Ms Grant said "the question of constitutional change and how that impacted on the 2020 targets" was the main point of contention on the EETC`s recent report on energy targets.
"These are questions that the Scottish Government has refused to answer and have used their (the SNP's) majority on the committee to remove them from the report," she said.
Mr McKenzie said: "Despite some witnesses expressing that view, all the evidence that we see coming forward is that companies continue to invest in renewable energy in Scotland, and that those sceptical about any uncertainty due to constitutional change are really just scaremongering with a political agenda."
Ms Grant said: "Companies that work in Scotland such as SSE can't be seen as political scaremongerers and need to be listened to, and it's very disappointing that the Government used its majority on the committee to close down the questioning on that aspect."