Calpine announced Thursday that an amended power-purchase agreement with PG&E was approved by the California Public Utilities Commission for the proposed Russell City Energy Center, a 600-megawatt power plant that would be placed near the Hayward shoreline.

That doesn’t mean the plant itself is approved. It has some of the required permits, but the main hurdle remaining is approval from the Bay Area Air Quality Management District, acting as a delegate of the federal Environmental Protection Agency.

The air district previously gave it the go ahead, meaning it didn’t find evidence that the plant would add significant amounts of pollution to the air, but that permit was revoked after a lawsuit on the grounds that BAAQMD did not follow federal guidelines for publicly noticing the permitting process.

The air district is currently reviewing and responding to public comments submitted regarding the permit. No time frame has been given in which a decision will be made.

We will have a larger story on this posted online Friday, running in Saturday’s paper.