HARRISBURG — Builders of wind farms, owners of coal-fired power plants and buyers of hybrid cars and solar panels would be among those to benefit from a $650 million compromise bill approved Wednesday by the state Senate to promote cleaner energies and conservation.

The measure was approved 44-5 on the Senate's last day of business for the year. It calls for tax credits, rebates, loans and grants over a decade or more in an effort to cut electricity bills and pollution and make Pennsylvania a destination for a booming renewable and cleaner energy industry.

Republicans who control the chamber advanced the bill, which is their response to the energy platform originally proposed by Gov. Ed Rendell 10 months ago. After weeks of talks, Republicans compromised with Democrats, adding $50 million for rebates on solar panels.

However, the bill is likely to undergo changes in the Democratic-led House of Representatives and is already being criticized by Rendell as spending too little money to make Pennsylvania competitive with other states that are trying to attract cutting-edge energy businesses.

Democrats on Tuesday tried, but failed, to remove a provision that would extend $25 million in grants for equipment to help coal-fired power plants meet toughening federal and state regulations on mercury and other pollutants.

The Senate also passed two biodiesel bills Wednesday, declining Rendell's request for legislation that would also support ethanol. One bill would require that biodiesel be added to each gallon of diesel sold in Pennsylvania in increasing amounts as in-state production of biodiesel reaches certain levels. The other would raise the in-state biodiesel production subsidy from 5 cents to 75 cents a gallon — at a cost of about $5 million — and expand an existing rebate program on purchases of gas-electric hybrid vehicles to other vehicles that burn alternative fuels.