BOSTON — Proposals are flooding in to help Massachusetts ramp up its reliance on renewable energy, including solar, wind and hydropower.The state has received nearly four dozen bids for a contract to add more renewable power to its energy portfolio — enough to power nearly 200,000 homes. The aim is to reduce Massachusetts' reliance on fossil fuels and greenhouse gas-emitting power plants, major contributors to climate change.It's the first part of a two-step process mandated by a new law signed by Republican Gov.