Being Good doesn’t pay with Warm Home Discount scheme

I was told I could claim 140 but because I chose a green energy provider, I can't

In October last year I received a letter from the government telling me not to miss out on 140 help with my energy costs through the Warm Home Discount scheme. I qualified as I receive the guarantee credit element of pension credit. However, I have since learned that this only applied to customers of the bigger electricity suppliers.

I am with Good Energy, which I chose because it supplies electricity from sustainable sources, but it is not in the scheme. So I lose out on 140. This seems grossly unfair. I have phoned Good Energy but there is nothing it can do. I also sent a message to my MP, to no avail. 140 would mean a lot. What a strange situation to be in. RS, Littleborough, Lancashire