I will try to answer your question.
The projects that are subject to the Impact Assessment Act are set out in Governor in Council regulations. They set out the types of projects, including certain oil and gas projects and their size, that are subject to the law. It's not a result of lobbying efforts or otherwise that a project would or would not be subject to the act. There is provision in the act as well for the minister to use discretionary authority to subject a project to impact assessment.