According to the given pyramid of energy, if T$_4$ is equivalent to 1000 J, then according to the 10 percent law, which states that only 10 percent of energy is transferred to each trophic level from the lower trophic level, the value at T$_1$ is 10,00,000 J.

$$\begin{aligned} & T_1=10,00,000 \mathrm{~J} \\ & T_2=\frac{10}{100} \times 10,00,000=1,00,000 \mathrm{~J} \\ & T_3=\frac{10}{100} \times 100000=10,000 \mathrm{~J} \\ & T_4=\frac{10}{100} \times 10000=1000 \mathrm{~J} \end{aligned}$$